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
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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
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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 + " " + 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(); } }