restful webservice json数据get方法（myeclipse）

创建web service project

添加代码

RestFul.java：

package com.webservice;


import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.List;





import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;




import javax.ws.rs.GET;

import net.sf.json.JSONArray;


import net.sf.json.JSONObject;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;


@Controller
@RequestMapping(value = "/getData")
public class RestFul {
    
    // http://localhost:8080/RestWebService/getData?userName=sun 方式的调用
    @RequestMapping
    public void printData1(HttpServletRequest request, HttpServletResponse response,
    @RequestParam(value="userName", defaultValue="User") String name) {
        List<UserInfo> uiList = new ArrayList<UserInfo>();
        for (int i=0; i<3; i++)
        {
            UserInfo ui = new UserInfo();
            //JSONObject map = new JSONObject();
            ui.ID = i;
            ui.Name = "SUN" + i;
            ui.Position = "Position" + i;
            uiList.add(ui);
            }
 
        JSONArray jsonArr = JSONArray.fromObject(uiList);
        String msg = jsonArr.toString();
        printData(response, msg);
    }


    // http://localhost:8080/RestWebService/getData/Sun/Royi 方式的调用
    @RequestMapping(value = "/{firstName}/{lastName}")
    public void printData2(HttpServletRequest request, HttpServletResponse response,
        @PathVariable String firstName, @PathVariable String lastName) {
        String msg = "Welcome "+ firstName + " " + lastName;
        printData(response, msg);
    }
    
    // 转换成HTML形式返回
    private void printData(HttpServletResponse response, String msg) {
        try {
            response.setContentType("text/html;charset=utf-8");
            response.setCharacterEncoding("UTF-8");
            PrintWriter out = new PrintWriter(new OutputStreamWriter(response.getOutputStream(), "UTF-8"));
            out.println(msg);
            out.close();
        } catch (Exception e) {  
            e.printStackTrace();
        }
   }

    // http://localhost:8080/RestWebService/getData/json?item=0 方式的调用
    @RequestMapping(value = "/json")
    public void printData3(HttpServletRequest request, HttpServletResponse response,
        @RequestParam(value="item", defaultValue="0") String item) {
        printDataJason(response, item);
    }


    // http://localhost:8080/RestWebService/getData/json/1 方式的调用
    @RequestMapping(value = "/json/{item}")
    public void printData4(HttpServletRequest request, HttpServletResponse response,
        @PathVariable String item) {
        printDataJason(response, item);
    }
    
    // JSON格式化
    private void printDataJason(HttpServletResponse response, String item) {
        String st = "";
        try {
           response.setContentType("text/html;charset=utf-8");
           response.setCharacterEncoding("UTF-8");
           PrintWriter out = new PrintWriter(new OutputStreamWriter(response.getOutputStream(), "UTF-8"));
           
           List<UserInfo> uiList = new ArrayList<UserInfo>();
           for (int i=0; i<3; i++)
           {
               UserInfo ui = new UserInfo();
               //JSONObject map = new JSONObject();
               ui.ID = i;
               ui.Name = "SUN" + i;
               ui.Position = "Position" + i;
               uiList.add(ui);
               out.close();
               }
     
           JSONArray jsonArr = JSONArray.fromObject(uiList);
           st = jsonArr.toString();
           }
           catch (Exception e) {  
               e.printStackTrace();  
           }
        printData(response, st);
        }
 
    // http://localhost:8080/RestWebService/getData/query
    @GET
    @RequestMapping(value = "/query", method = RequestMethod.GET)
    @ResponseBody
    private String printDataJason1() {
        String st = "";
        try {
           List<UserInfo> uiList = new ArrayList<UserInfo>();
           for (int i=0; i<3; i++)
           {
               UserInfo ui = new UserInfo();
               //JSONObject map = new JSONObject();
               ui.ID = i;
               ui.Name = "SUN" + i;
               ui.Position = "Position" + i;
               uiList.add(ui);
               }
     
           JSONArray jsonArr = JSONArray.fromObject(uiList);
           st = jsonArr.toString();
           }
           catch (Exception e) {  
               e.printStackTrace();  
           }
        return st;
        }
}

添加代码
UserInfo.java

package com.webservice;

public class UserInfo{
    
    Integer ID;
    
    String Name;
    
    String Position;

    public Integer getID() {
        return ID;
    }

    public void setID(Integer iD) {
        ID = iD;
    }

    public String getName() {
        return Name;
    }

    public void setName(String name) {
        Name = name;
    }

    public String getPosition() {
        return Position;
    }

    public void setPosition(String position) {
        Position = position;
    }
    
}

添加配置文件

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_3_0.xsd" version="3.0">
  <display-name>RestWebService</display-name>

    <!-- spring -->
    <servlet>
        <servlet-name>springMVC</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>/WEB-INF/springmvc-servlet.xml</param-value>
        </init-param>
        <load-on-startup>2</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>springMVC</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
</web-app>

配置文件rest-servlet.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans:beans xmlns="http://www.springframework.org/schema/mvc"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:beans="http://www.springframework.org/schema/beans"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
 
    <!-- Enables the Spring MVC @Controller programming model -->
    <annotation-driven />
 
   <!-- for processing requests with annotated controller methods and set Message Convertors from the list of convertors -->
    <beans:bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">
        <beans:property name="messageConverters">
            <beans:list>
                <beans:ref bean="jsonMessageConverter"/>
            </beans:list>
        </beans:property>
    </beans:bean>
 
    <!-- To  convert JSON to Object and vice versa -->
    <beans:bean id="jsonMessageConverter" class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
    </beans:bean>
 
    <context:component-scan base-package="net.javaonline.spring.restful" />
 
</beans:beans>

配置文件springmvc-servlet.xml

<?xml version="1.0" encoding="UTF-8"?>  
<beans xmlns="http://www.springframework.org/schema/beans"  
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  
       xmlns:context="http://www.springframework.org/schema/context"  
       xmlns:mvc="http://www.springframework.org/schema/mvc"  
       xsi:schemaLocation="http://www.springframework.org/schema/beans  http://www.springframework.org/schema/beans/spring-beans-3.0.xsd  
       http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd  
       http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">  
 
    <context:annotation-config/>  
      
    <mvc:default-servlet-handler/>  
 
    <!-- 默认访问跳转到登录页面 -->  
    <mvc:view-controller path="/" view-name="redirect:/getData" />  
 
    <!-- Scans the classpath of this application for @Components to deploy as beans -->  
    <context:component-scan base-package="com.webservice">  
        <context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/>  
    </context:component-scan>  
 
    <!-- 采用SpringMVC自带的JSON转换工具，支持@ResponseBody注解 -->  
    <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">  
        <property name="messageConverters">  
            <list>  
                <ref bean="stringHttpMessageConverter" />  
            </list>  
        </property>  
    </bean>  
 
    <bean id="stringHttpMessageConverter" class="org.springframework.http.converter.StringHttpMessageConverter">  
        <property name ="supportedMediaTypes">  
            <list>  
                <value>text/plain;charset=UTF-8</value>  
            </list>  
        </property>  
    </bean>  
 
    <!-- Configures the @Controller programming model -->  
    <mvc:annotation-driven/>  
 
</beans>  

工程目录

注意事项

导入包时一定要把json相关jar包放到项目的lib目录下