发布webservice到tomcat

st0627

　　目标：
　　基于契约优先的webservice功能开发
　　服务端
　　一、编写xsd和wsdl文件（validate必须要通过，注意命名空间要一致），放到WEB-INF/wsdl目录下
　　二、项目中引入jaxws-ri的相关jar包；WEB-INF下增加sun-jaxws.xml（配置服务的实现类）；在web.xml中配置jaxws-ri提供的监听器WSServletContextListener；在web.xml中配置jaxws-ri提供的Servlet：WSServlet
　　三、使用wsimport命令将本地wsdl转换为java文件，拷贝服务接口源文件到服务端（删除@XmlSeeAlso({ObjectFactory.class}) ，将异常类改为自定义的异常---该异常应该继承自Exception，如果是runtimeexception，服务端也会抛出异常）
　　四、编写实现类，配置一些注解endpointInterface，wsdlLocation，targetNamespace，serviceName，portName等
　　五、部署项目到tomcat并启动。
　　备注：在wsdl中通过include或者import引入xsd文件，通过wsimport获取服务端的接口以及客户端生成的java文件，有可能会出现问题，如，客户端调用list()在服务端返回时有对象，但是客户端获取到的就是null。
　　如果将schema的定义全部放到wsdl中，客户端访问webservice的list()就不会出现问题。这是怎么回事呢？

如果都正常了，则可以将schema的定义单独放到xsd文件中，又没事了！
　　所以，先将schema的定义放到wsdl中，这样通过wsdl生成的客户端代码才能与服务端顺利的进行沟通！如果分离开，启动服务，生成的客户端代码调用服务是有问题的，切记！！！

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<wsdl:definitions xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/"
xmlns:tns="http://service.hqh.com" xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/"
xmlns:xsd="http://www.w3.org/2001/XMLSchema" name="UserService"
targetNamespace="http://service.hqh.com">
<wsdl:types>
<!-- <xsd:schema targetNamespace="http://service.hqh.com"> <xsd:include
schemaLocation="user.xsd"/> </xsd:schema> -->
<!-- <xsd:schema> <xsd:import namespace="http://service.hqh.com" schemaLocation="user.xsd"
/> </xsd:schema> -->
<xsd:schema targetNamespace="http://service.hqh.com">
<xsd:element name="add" type="tns:add" />
<xsd:element name="addResponse" type="tns:addResponse" />
<xsd:element name="delete" type="tns:delete" />
<xsd:element name="deleteResponse" type="tns:deleteResponse" />
<xsd:element name="list" type="tns:list" />
<xsd:element name="listResponse" type="tns:listResponse" />
<xsd:element name="login" type="tns:login" />
<xsd:element name="loginResponse" type="tns:loginResponse" />
<xsd:element name="UserException" type="tns:UserException"></xsd:element>
<xsd:complexType name="UserException">
<xsd:sequence>
<xsd:element name="error" type="xsd:string" />
</xsd:sequence>
</xsd:complexType>
<xsd:complexType name="add">
<xsd:sequence>
<xsd:element name="user" type="tns:user" />
</xsd:sequence>
</xsd:complexType>
<xsd:complexType name="addResponse">
<xsd:sequence />
</xsd:complexType>
<xsd:complexType name="delete">
<xsd:sequence>
<xsd:element name="id" type="xsd:int"></xsd:element>
</xsd:sequence>
</xsd:complexType>
<xsd:complexType name="deleteResponse">
<xsd:sequence />
</xsd:complexType>
<xsd:complexType name="list">
<xsd:sequence />
</xsd:complexType>
<xsd:complexType name="listResponse">
<xsd:sequence minOccurs="1" maxOccurs="unbounded">
<xsd:element name="users" type="tns:user" />
</xsd:sequence>
</xsd:complexType>
<xsd:complexType name="login">
<xsd:sequence>
<xsd:element name="name" type="xsd:string" />
<xsd:element name="pwd" type="xsd:string" />
</xsd:sequence>
</xsd:complexType>
<xsd:complexType name="loginResponse">
<xsd:sequence>
<xsd:element name="user" type="tns:user" />
</xsd:sequence>
</xsd:complexType>
<xsd:complexType name="user">
<xsd:sequence>
<xsd:element name="id" type="xsd:int" />
<xsd:element name="name" type="xsd:string" />
<xsd:element name="pwd" type="xsd:string" />
</xsd:sequence>
</xsd:complexType>
</xsd:schema>
</wsdl:types>
<!-- 添加异常 消息 -->
<wsdl:message name="UserException">
<wsdl:part name="fault" element="tns:UserException" />
</wsdl:message>
<wsdl:message name="add">
<wsdl:part element="tns:add" name="parameters" />
</wsdl:message>
<wsdl:message name="addResponse">
<wsdl:part element="tns:addResponse" name="parameters" />
</wsdl:message>
<wsdl:message name="delete">
<wsdl:part element="tns:delete" name="parameters" />
</wsdl:message>
<wsdl:message name="deleteResponse">
<wsdl:part element="tns:deleteResponse" name="parameters" />
</wsdl:message>
<wsdl:message name="list">
<wsdl:part element="tns:list" name="parameters" />
</wsdl:message>
<wsdl:message name="listResponse">
<wsdl:part element="tns:listResponse" name="parameters" />
</wsdl:message>
<wsdl:message name="login">
<wsdl:part element="tns:login" name="parameters" />
</wsdl:message>
<wsdl:message name="loginResponse">
<wsdl:part element="tns:loginResponse" name="parameters" />
</wsdl:message>
<!-- 指定接口和方法 -->
<wsdl:portType name="IUserService">
<wsdl:operation name="add">
<wsdl:input message="tns:add" />
<wsdl:output message="tns:addResponse" />
<!-- 异常 -->
<wsdl:fault name="UserException" message="tns:UserException"></wsdl:fault>
</wsdl:operation>
<wsdl:operation name="delete">
<wsdl:input message="tns:delete" />
<wsdl:output message="tns:deleteResponse" />
</wsdl:operation>
<wsdl:operation name="list">
<wsdl:input message="tns:list" />
<wsdl:output message="tns:listResponse" />
</wsdl:operation>
<wsdl:operation name="login">
<wsdl:input message="tns:login" />
<wsdl:output message="tns:loginResponse" />
<!-- 异常 -->
<wsdl:fault name="UserException" message="tns:UserException"></wsdl:fault>
</wsdl:operation>
</wsdl:portType>
<!-- 编码格式 -->
<wsdl:binding name="userServiceSOAP" type="tns:IUserService">
<soap:binding style="document"
transport="http://schemas.xmlsoap.org/soap/http" />
<wsdl:operation name="add">
<wsdl:input>
<soap:body use="literal" />
</wsdl:input>
<wsdl:output>
<soap:body use="literal" />
</wsdl:output>
<!-- 异常 -->
<wsdl:fault name="UserException">
<soap:fault name="UserException" use="literal" />
</wsdl:fault>
</wsdl:operation>
<wsdl:operation name="delete">
<wsdl:input>
<soap:body use="literal" />
</wsdl:input>
<wsdl:output>
<soap:body use="literal" />
</wsdl:output>
</wsdl:operation>
<wsdl:operation name="list">
<wsdl:input>
<soap:body use="literal" />
</wsdl:input>
<wsdl:output>
<soap:body use="literal" />
</wsdl:output>
</wsdl:operation>
<wsdl:operation name="login">
<wsdl:input>
<soap:body use="literal" />
</wsdl:input>
<wsdl:output>
<soap:body use="literal" />
</wsdl:output>
<!-- 异常 -->
<wsdl:fault name="UserException">
<soap:fault name="UserException" use="literal" />
</wsdl:fault>
</wsdl:operation>
</wsdl:binding>
<!-- 服务 -->
<wsdl:service name="UserService">
<wsdl:port binding="tns:userServiceSOAP" name="userServicePort">
<!-- 通过jaxws-ri.jax中的servlet对访问进行监听，这里配置的地址很关键，根目录后跟servlet的url-pattern，保持一致 -->
<soap:address location="http://localhost:8080/Demo/service" />
</wsdl:port>
</wsdl:service>
</wsdl:definitions>

　　客户端
　　一、客户端通过服务端发布的地址得到wsdl并使用wsdl转换为java文件。
　　二、客户端将所有转换的java文件拷贝至项目中（字节码文件不要拷贝到项目中，否则启动会报错）
　　三、获取port，访问服务端对外公布的方法
　　需要注意的地方：
　　服务端的接口文件，来源：通过本地wsdl文件使用wsimport命令转换而来
　　客户端的java文件，来源：服务端启动服务，通过可访问的url地址使用wsimport命令转换而来
　　服务端与客户端的版本必须保持一致，即服务端一旦有变化，客户端使用的访问服务端的java文件必须根据新的wsdl来生成，否则访问服务端的方法有可能得不到正确的返回值！！！
　　尽量保持命名的一致性，很多地方是有对应关系的，不能一边大写一边小写
　　服务端
　　1.将编写好的user.xsd和user.wsdl文件放到WEB-INF/wsdl目录下

<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
targetNamespace="http://service.hqh.com" xmlns:tns="http://service.hqh.com"
elementFormDefault="qualified">
<xsd:element name="add" type="tns:add" />
<xsd:element name="addResponse" type="tns:addResponse" />
<xsd:element name="delete" type="tns:delete" />
<xsd:element name="deleteResponse" type="tns:deleteResponse" />
<xsd:element name="list" type="tns:list" />
<xsd:element name="listResponse" type="tns:listResponse" />
<xsd:element name="login" type="tns:login" />
<xsd:element name="loginResponse" type="tns:loginResponse" />
<xsd:element name="UserException" type="tns:UserException"></xsd:element>
<xsd:complexType name="UserException">
<xsd:sequence>
<xsd:element name="error" type="xsd:string"/>
</xsd:sequence>
</xsd:complexType>
<xsd:complexType name="add">
<xsd:sequence>
<xsd:element name="user" type="tns:user" />
</xsd:sequence>
</xsd:complexType>
<xsd:complexType name="addResponse">
<xsd:sequence />
</xsd:complexType>
<xsd:complexType name="delete">
<xsd:sequence>
<xsd:element name="id" type="xsd:int"></xsd:element>
</xsd:sequence>
</xsd:complexType>
<xsd:complexType name="deleteResponse">
<xsd:sequence />
</xsd:complexType>
<xsd:complexType name="list">
<xsd:sequence />
</xsd:complexType>
<xsd:complexType name="listResponse">
<xsd:sequence minOccurs="1" maxOccurs="unbounded">
<xsd:element name="users" type="tns:user"/>
</xsd:sequence>
</xsd:complexType>
<xsd:complexType name="login">
<xsd:sequence>
<xsd:element name="name" type="xsd:string" />
<xsd:element name="pwd" type="xsd:string" />
</xsd:sequence>
</xsd:complexType>
<xsd:complexType name="loginResponse">
<xsd:sequence>
<xsd:element name="user" type="tns:user" />
</xsd:sequence>
</xsd:complexType>
<xsd:complexType name="user">
<xsd:sequence>
<xsd:element name="id" type="xsd:int" />
<xsd:element name="name" type="xsd:string" />
<xsd:element name="pwd" type="xsd:string" />
</xsd:sequence>
</xsd:complexType>
</xsd:schema>

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<wsdl:definitions xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/"
xmlns:tns="http://service.hqh.com" xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/"
xmlns:xsd="http://www.w3.org/2001/XMLSchema" name="UserService"
targetNamespace="http://service.hqh.com">
<wsdl:types>
<!--
<xsd:schema targetNamespace="http://service.hqh.com">
<xsd:include schemaLocation="user.xsd"/>
</xsd:schema>
-->
<!--  -->
<xsd:schema>
<xsd:import namespace="http://service.hqh.com" schemaLocation="user.xsd" />
</xsd:schema>
</wsdl:types>
<!-- 添加异常 消息 -->
<wsdl:message name="UserException">
<wsdl:part name="fault" element="tns:UserException" />
</wsdl:message>
<wsdl:message name="add">
<wsdl:part element="tns:add" name="parameters" />
</wsdl:message>
<wsdl:message name="addResponse">
<wsdl:part element="tns:addResponse" name="parameters" />
</wsdl:message>
<wsdl:message name="delete">
<wsdl:part element="tns:delete" name="parameters" />
</wsdl:message>
<wsdl:message name="deleteResponse">
<wsdl:part element="tns:deleteResponse" name="parameters" />
</wsdl:message>
<wsdl:message name="list">
<wsdl:part element="tns:list" name="parameters" />
</wsdl:message>
<wsdl:message name="listResponse">
<wsdl:part element="tns:listResponse" name="parameters" />
</wsdl:message>
<wsdl:message name="login">
<wsdl:part element="tns:login" name="parameters" />
</wsdl:message>
<wsdl:message name="loginResponse">
<wsdl:part element="tns:loginResponse" name="parameters" />
</wsdl:message>
<!-- 指定接口和方法 -->
<wsdl:portType name="IUserService">
<wsdl:operation name="add">
<wsdl:input message="tns:add" />
<wsdl:output message="tns:addResponse" />
<!-- 异常 -->
<wsdl:fault name="UserException" message="tns:UserException"></wsdl:fault>
</wsdl:operation>
<wsdl:operation name="delete">
<wsdl:input message="tns:delete" />
<wsdl:output message="tns:deleteResponse" />
</wsdl:operation>
<wsdl:operation name="list">
<wsdl:input message="tns:list" />
<wsdl:output message="tns:listResponse" />
</wsdl:operation>
<wsdl:operation name="login">
<wsdl:input message="tns:login" />
<wsdl:output message="tns:loginResponse" />
<!-- 异常 -->
<wsdl:fault name="UserException" message="tns:UserException"></wsdl:fault>
</wsdl:operation>
</wsdl:portType>
<!-- 编码格式 -->
<wsdl:binding name="userServiceSOAP" type="tns:IUserService">
<soap:binding style="document"
transport="http://schemas.xmlsoap.org/soap/http" />
<wsdl:operation name="add">
<wsdl:input>
<soap:body use="literal" />
</wsdl:input>
<wsdl:output>
<soap:body use="literal" />
</wsdl:output>
<!-- 异常 -->
<wsdl:fault name="UserException">
<soap:fault name="UserException" use="literal" />
</wsdl:fault>
</wsdl:operation>
<wsdl:operation name="delete">
<wsdl:input>
<soap:body use="literal" />
</wsdl:input>
<wsdl:output>
<soap:body use="literal" />
</wsdl:output>
</wsdl:operation>
<wsdl:operation name="list">
<wsdl:input>
<soap:body use="literal" />
</wsdl:input>
<wsdl:output>
<soap:body use="literal" />
</wsdl:output>
</wsdl:operation>
<wsdl:operation name="login">
<wsdl:input>
<soap:body use="literal" />
</wsdl:input>
<wsdl:output>
<soap:body use="literal" />
</wsdl:output>
<!-- 异常 -->
<wsdl:fault name="UserException">
<soap:fault name="UserException" use="literal" />
</wsdl:fault>
</wsdl:operation>
</wsdl:binding>
<!-- 服务 -->
<wsdl:service name="UserService">
<wsdl:port binding="tns:userServiceSOAP" name="userServicePort">
<!-- 通过jaxws-ri.jax中的servlet对访问进行监听，这里配置的地址很关键，根目录后跟servlet的url-pattern，保持一致 -->
<soap:address location="http://localhost:8080/Demo/service" />
</wsdl:port>
</wsdl:service>
</wsdl:definitions>

　　2.项目中引入jaxws-ri压缩包下的lib包中的jar
　　3.WEB-INF下新建一个sun-jaxws.xml

<?xml version="1.0" encoding="UTF-8"?>
<endpoints xmlns="http://java.sun.com/xml/ns/jax-ws/ri/runtime" version="2.0">
<!-- name配置服务的名称   implementation配置对应的实现类  url-pattern配置浏览器中访问本服务的地址-->
<endpoint name="UserService"
implementation="com.hqh.service.UserServiceImpl"
url-pattern="/service"/>
</endpoints>
　　4.配置web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
<!-- 配置webservice，使用 jaxws-ri.jar 进行支持-->
<!-- 监听器 -->
<listener>
<!-- 引入jaxws-ri.jar中的监听器 -->
<listener-class>com.sun.xml.ws.transport.http.servlet.WSServletContextListener</listener-class>
</listener>
<servlet>
<!-- servlet-name与sun-jaxws.xml中的name一致 -->
<servlet-name>UserService</servlet-name>
<!-- 使用jaxws-ri.jar中的servlet -->
<servlet-class>com.sun.xml.ws.transport.http.servlet.WSServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>UserService</servlet-name>
<!-- servlet-name与sun-jaxws.xml中的url-pattern一致 -->
<url-pattern>/service</url-pattern>
</servlet-mapping>
</web-app>
　　使用wsimort将本地wsdl文件转换为java文件

wsimport -d destination_folder -keep xxx.wsdl

　　5.接口(事先已经编写好wsdl文件，通过wsimport可以将其转换为java文件，此时将转换后的接口文件拷贝到项目中作为接口使用，由于已经在接口中定义好了各种注解，所以能够很好的帮助完成服务于wsdl的映射)

package com.hqh.service;
import java.util.List;
import javax.jws.WebMethod;
import javax.jws.WebParam;
import javax.jws.WebResult;
import javax.jws.WebService;
import javax.xml.bind.annotation.XmlSeeAlso;
import javax.xml.ws.RequestWrapper;
import javax.xml.ws.ResponseWrapper;
import com.hqh.model.User;

/**
* This class was generated by the JAX-WS RI.
* JAX-WS RI 2.1.6 in JDK 6
* Generated source version: 2.1
*
*/
@WebService(name = "IUserService", targetNamespace = "http://service.hqh.com")
public interface IUserService {

/**
*
* @param user
* @throws UserException_Exception
*/
@WebMethod
@RequestWrapper(localName = "add", targetNamespace = "http://service.hqh.com", className = "com.hqh.service.Add")
@ResponseWrapper(localName = "addResponse", targetNamespace = "http://service.hqh.com", className = "com.hqh.service.AddResponse")
public void add(
@WebParam(name = "user", targetNamespace = "")
User user)
throws UserException
;
/**
*
* @param id
*/
@WebMethod
@RequestWrapper(localName = "delete", targetNamespace = "http://service.hqh.com", className = "com.hqh.service.Delete")
@ResponseWrapper(localName = "deleteResponse", targetNamespace = "http://service.hqh.com", className = "com.hqh.service.DeleteResponse")
public void delete(
@WebParam(name = "id", targetNamespace = "")
int id);
/**
*
* @return
*     returns java.util.List<com.hqh.service.User>
*/
@WebMethod
@WebResult(name = "users", targetNamespace = "")
@RequestWrapper(localName = "list", targetNamespace = "http://service.hqh.com", className = "com.hqh.service.List")
@ResponseWrapper(localName = "listResponse", targetNamespace = "http://service.hqh.com", className = "com.hqh.service.ListResponse")
public List<User> list();
/**
*
* @param pwd
* @param name
* @return
*     returns com.hqh.service.User
* @throws UserException_Exception
*/
@WebMethod
@WebResult(name = "user", targetNamespace = "")
@RequestWrapper(localName = "login", targetNamespace = "http://service.hqh.com", className = "com.hqh.service.Login")
@ResponseWrapper(localName = "loginResponse", targetNamespace = "http://service.hqh.com", className = "com.hqh.service.LoginResponse")
public User login(
@WebParam(name = "name", targetNamespace = "")
String name,
@WebParam(name = "pwd", targetNamespace = "")
String pwd)
throws UserException
;
}

　　6.实现类

package com.hqh.service;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import javax.jws.WebService;
import com.hqh.model.User;

/**必须指定targetNamespace，否则服务无法启动*/
/*file:/E:/technology-hqh/proj/webservice/JAX-WS/Demo/build/classes/META-INF/wsdl/user.wsdl
has the following services [{http://service.hqh.com}UserService]
but not {http://service.hqh.com/}UserService.
Maybe you forgot to specify a service name in @WebService/@WebServiceProvider?*/
@WebService(endpointInterface="com.hqh.service.IUserService",
wsdlLocation="WEB-INF/wsdl/user.wsdl",
serviceName="UserService",
portName="userServicePort",
targetNamespace="http://service.hqh.com")
public class UserServiceImpl implements IUserService {
private static List<User> users = new ArrayList<User>();
static {
users.add(new User(1,"zs","zs"));
}
@Override
public void add(User user) throws UserException{
for(User u:users) {
if(u.getName().equals(user.getName())) {
throw new UserException("用户已存在!",null);
}
}
users.add(user);
}
@Override
public void delete(int id) {
for (Iterator iterator = users.iterator(); iterator.hasNext();) {
User user = (User) iterator.next();
if(id==user.getId()) {
users.remove(user);
break;
}
}
}
@Override
public List<User> list() {
return users;
}
@Override
public User login(String name, String pwd) throws UserException{
for(User user : users) {
if(name.equals(user.getName()) && pwd.equals(user.getPwd())) {
return user;
}
}
throw new UserException("用户不存在",null);
}
}

　　模型

package com.hqh.model;

public class User {
private int id;
private String name;
private String pwd;
public User() {
super();
}
public User(int id, String name, String pwd) {
super();
this.id = id;
this.name = name;
this.pwd = pwd;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPwd() {
return pwd;
}
public void setPwd(String pwd) {
this.pwd = pwd;
}
}

　　异常类

package com.hqh.service;
public class UserException extends Exception {
public UserException() {
super();
}
public UserException(String message, Throwable cause) {
super(message, cause);
}
public UserException(String message) {
super(message);
}
public UserException(Throwable cause) {
super(cause);
}
}

 　　部署web项目到tomcat并启动，访问http://localhost:8080/Demo/service?wsdl就能看到wsdl文件
　　成功！
　　客户端
　　通过服务端提供的服务地址，转换wsdl为本地java文件，将所有java文件拷贝至客户端项目中
　　通过getXXXServicePort()获取到接口的实现类，即可调用服务！
　　客户端Servlet

package com.hqh.service.servlet;

import java.io.IOException;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.hqh.service.IUserService;
import com.hqh.service.User;
import com.hqh.service.UserService;

/**
* Servlet implementation class UserServlet
*/
public class UserServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
private IUserService service;
private UserService serviceImpl;
public UserServlet() {
super();
System.out.println("UserServlet.UserServlet()");
//初始化服务端口调用类
serviceImpl = new UserService();
service = serviceImpl.getUserServicePort();
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doPost(request, response);
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String method = request.getParameter("method");
if(method==null || "".equals(method)) {
list(request,response);
}
}
private void list(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
List<User> users = service.list();
request.setAttribute("users", users);
request.getRequestDispatcher("/list.jsp").forward(request, response);
}
}

　　index.jsp 调用servlet，在servlet中访问webservice服务

<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<a href="/Demo_client/userServlet">查看user list</a>
</body>
</html>
　　list.jsp 显示从服务端传递回来的对象信息

<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<c:forEach items="${users}" var="user">
${user.id}---${user.name }---${user.pwd } <br/>
</c:forEach>
</body>
</html>
　　备注：eclipse中使用JSTL标签需要引入两个jar包，jstl.jar和standard.jar；将tld中的c.tld,fn.tld,fmt.tld三个最常用的tld文件拷贝至WEB-INF目录下任意位置，在jsp中引入taglib标签后，即可使用。