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（九）springmvc之json的处理（服务端发送json数据到客户端）

2017-11-03 15:13 706 查看

 

一、json处理方法有两种

 

　　　　1：导入Spring需要json的jar包。（本例使用）

　　　　　　　　使用@ResponseBody该注解用于将Controller的方法返回的对象，通过HttpMessageConverter接口转换为指定格式的数据如：json,xml等，通过　　　　　　　　　Response响应给客户端   　　

　　　　

　　 　 2：springmvc.xml中配置转换json的配置。

　　　

二、案例一：使用@ResponseBody

  • 　　　依赖的包

<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>2.5.1</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.5.1</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-annotations</artifactId>
<version>2.5.1</version>
</dependency>

 

index.jsp

<script type="text/javascript" src="<%=request.getContextPath()%>/script/jquery-1.7.2.min.js"></script>
<script type="text/javascript" src="<%=request.getContextPath()%>/script/jquery.json-2.4.js"></script>
<script type="text/javascript" src="<%=request.getContextPath()%>/script/jquery.form.js"></script>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<script type="text/javascript">
function ajax_json_1(){
var getURL = "<%=request.getContextPath()%>/jsonController/dogList?date="+new Date()+"";
jQuery.get(getURL,function(jsonList){
for(var i = 0;i<jsonList.length;i++){
var dogBean = jsonList[i];
window.alert(dogBean.dogid);
}
},"json");
}
</script>
</head>
<body>

<a href="javascript:void(0);" onclick="ajax_json_1();">jQuery来访问_SpringMVC返回json对象</a>
</body>

controller

package com.shyroke.controller;

import java.util.ArrayList;
import java.util.List;

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

import com.shyroke.bean.DogBean;

@Controller
@RequestMapping(value="/jsonController")
public class JsonController {

@RequestMapping(value="/dogList")
@ResponseBody
public List<DogBean> getListDog(){
List<DogBean> dogList=new ArrayList<DogBean>();
DogBean dog1=new DogBean();
dog1.setDogid("1");
dog1.setDogname("dog1");

DogBean dog2=new DogBean();
dog2.setDogid("2");
dog2.setDogname("dog2");

dogList.add(dog1);
dogList.add(dog2);
return dogList;
}

}

 

三、案例二：服务端使用原始的方式返回json数据，方法不需要有返回值

  • 同样需要引入上例的包

<script type="text/javascript" src="<%=request.getContextPath()%>/script/jquery-1.7.2.min.js"></script>
<script type="text/javascript" src="<%=request.getContextPath()%>/script/jquery.json-2.4.js"></script>
<script type="text/javascript" src="<%=request.getContextPath()%>/script/jquery.form.js"></script>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<script type="text/javascript">function ajax_json_2(){
var getURL = "<%=request.getContextPath()%>/jsonController/dogBean?date="+new Date()+"";
jQuery.get(getURL,function(jsonObj){
window.alert(jsonObj.dogid + "\t\t" + jsonObj.dogname);
},"json");
}

</script>
</head>
<body>
<a href="javascript:void(0);" onclick="ajax_json_2();">jQuery来访问_原始返回json对象</a>
</body>

controller

package com.shyroke.controller;

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

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

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

import com.fasterxml.jackson.annotation.JsonInclude.Include;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;
import com.shyroke.bean.DogBean;

@Controller
@RequestMapping(value="/jsonController")
public class JsonController {

@RequestMapping(value="dogBean")
public void GetDog(HttpServletRequest request,HttpServletResponse response) throws Exception{
PrintWriter out=response.getWriter();

DogBean dog1=new DogBean();
dog1.setDogid("1");
dog1.setDogname("dog1");

/**
* 转成json字符串。
*/
ObjectMapper objectMapper = new ObjectMapper();
objectMapper.configure(SerializationFeature.INDENT_OUTPUT, true);
// 配置mapper忽略空属性
objectMapper.setSerializationInclusion(Include.NON_EMPTY);

String jsonStr = objectMapper.writeValueAsString(dog1);

out.print(jsonStr);
out.flush();
out.close();
}
}

 

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