SpringMVC返回json数据的三种方式

1、第一种方式是spring2时代的产物,也就是每个json视图controller配置一个Jsoniew。

如:<bean id="defaultJsonView" class="org.springframework.web.servlet.view.json.MappingJacksonJsonView"/> 

或者<bean id="defaultJsonView" class="org.springframework.web.servlet.view.json.MappingJackson2JsonView"/>

同样要用jackson的jar包。


2、第二种使用JSON工具将对象序列化成json,常用工具Jackson,fastjson,gson。

利用HttpServletResponse,然后获取response.getOutputStream()或response.getWriter()

直接输出。

示例:

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  1. public class JsonUtil  
  2. {  
  3.       
  4.     private static Gson gson=new Gson();  
  5.   
  6.   
  7.     /** 
  8.      * @MethodName : toJson 
  9.      * @Description : 将对象转为JSON串,此方法能够满足大部分需求 
  10.      * @param src 
  11.      *            :将要被转化的对象 
  12.      * @return :转化后的JSON串 
  13.      */  
  14.     public static String toJson(Object src) {  
  15.         if (src == null) {  
  16.             return gson.toJson(JsonNull.INSTANCE);  
  17.         }  
  18.         return gson.toJson(src);  
  19.     }  
  20. }  


3、第三种利用spring mvc3的注解@ResponseBody

例如:

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  1. @ResponseBody  
  2.   @RequestMapping("/list")  
  3.   public List<String> list(ModelMap modelMap) {  
  4.     String hql = "select c from Clothing c ";  
  5.     Page<Clothing> page = new Page<Clothing>();  
  6.     page.setPageSize(6);  
  7.     page  = clothingServiceImpl.queryForPageByHql(page, hql);  
  8.       
  9.     return page.getResult();  
  10.   }  

然后使用spring mvc的默认配置就可以返回json了,不过需要jackson的jar包哦。

注意:当springMVC-servlet.xml中使用<mvc:annotation-driven />时,如果是3.1之前已经默认注入AnnotationMethodHandlerAdapter,3.1之后默认注入RequestMappingHandlerAdapter只需加上上面提及的jar包即可!

如果是手动注入RequestMappingHandlerAdapter 可以这样设置

配置如下:

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text-decoration: none; border: none; padding: 0px; margin: 0px 10px 0px 0px; font-size: 9px; background-image: none; background-attachment: initial; background-color: inherit; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;">?</a></div></div><ol start="1" class="dp-xml" style="padding: 0px; border: none; color: rgb(92, 92, 92); margin: 0px 0px 1px 45px !important;"><li class="alt" style="border-style: none none none solid; border-left-width: 3px; border-left-color: rgb(108, 226, 108); list-style: decimal-leading-zero outside; color: inherit; line-height: 18px; margin: 0px !important; padding: 0px 3px 0px 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"><span class="tag" style="margin: 0px; padding: 0px; border: none; color: rgb(153, 51, 0); font-weight: bold; background-color: inherit;"><</span><span class="tag-name" style="margin: 0px; padding: 0px; border: none; color: rgb(153, 51, 0); font-weight: bold; background-color: inherit;">bean</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> </span><span class="attribute" style="margin: 0px; padding: 0px; border: none; color: red; background-color: inherit;">class</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;">=</span><span class="attribute-value" style="margin: 0px; padding: 0px; border: none; color: blue; background-color: inherit;">"org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter"</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;">  </span></span></li><li style="border-style: none none none solid; border-left-width: 3px; border-left-color: rgb(108, 226, 108); list-style: decimal-leading-zero outside; line-height: 18px; margin: 0px !important; padding: 0px 3px 0px 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;">        <span class="attribute" style="margin: 0px; padding: 0px; border: none; color: red; background-color: inherit;">p:ignoreDefaultModelOnRedirect</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;">=</span><span class="attribute-value" style="margin: 0px; padding: 0px; border: none; color: blue; background-color: inherit;">"true"</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> </span><span class="tag" style="margin: 0px; padding: 0px; border: none; color: rgb(153, 51, 0); font-weight: bold; background-color: inherit;">></span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;">  </span></span></li><li class="alt" style="border-style: none none none solid; border-left-width: 3px; border-left-color: rgb(108, 226, 108); list-style: decimal-leading-zero outside; color: inherit; line-height: 18px; margin: 0px !important; padding: 0px 3px 0px 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;">            <span class="tag" style="margin: 0px; padding: 0px; border: none; color: rgb(153, 51, 0); font-weight: bold; background-color: inherit;"><</span><span class="tag-name" style="margin: 0px; padding: 0px; border: none; color: rgb(153, 51, 0); font-weight: bold; background-color: inherit;">property</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> </span><span class="attribute" style="margin: 0px; padding: 0px; border: none; color: red; background-color: inherit;">name</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;">=</span><span class="attribute-value" style="margin: 0px; padding: 0px; border: none; color: blue; background-color: inherit;">"messageConverters"</span><span class="tag" style="margin: 0px; padding: 0px; border: none; color: rgb(153, 51, 0); font-weight: bold; background-color: inherit;">></span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;">  </span></span></li><li style="border-style: none none none solid; border-left-width: 3px; border-left-color: rgb(108, 226, 108); list-style: decimal-leading-zero outside; line-height: 18px; margin: 0px !important; padding: 0px 3px 0px 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;">                <span class="tag" style="margin: 0px; padding: 0px; border: none; color: rgb(153, 51, 0); font-weight: bold; background-color: inherit;"><</span><span class="tag-name" style="margin: 0px; padding: 0px; border: none; color: rgb(153, 51, 0); font-weight: bold; background-color: inherit;">list</span><span class="tag" style="margin: 0px; padding: 0px; border: none; color: rgb(153, 51, 0); font-weight: bold; background-color: inherit;">></span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;">  </span></span></li><li class="alt" style="border-style: none none none solid; border-left-width: 3px; border-left-color: rgb(108, 226, 108); list-style: decimal-leading-zero outside; color: inherit; line-height: 18px; margin: 0px !important; padding: 0px 3px 0px 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;">                    <span class="tag" style="margin: 0px; padding: 0px; border: none; color: rgb(153, 51, 0); font-weight: bold; background-color: inherit;"><</span><span class="tag-name" style="margin: 0px; padding: 0px; border: none; color: rgb(153, 51, 0); font-weight: bold; background-color: inherit;">bean</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> </span><span class="attribute" style="margin: 0px; padding: 0px; border: none; color: red; background-color: inherit;">class</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;">=</span><span class="attribute-value" style="margin: 0px; padding: 0px; border: none; color: blue; background-color: inherit;">"org.springframework.http.converter.json.MappingJacksonHttpMessageConverter"</span><span class="tag" style="margin: 0px; padding: 0px; border: none; color: rgb(153, 51, 0); font-weight: bold; background-color: inherit;">/></span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;">  </span></span></li><li style="border-style: none none none solid; border-left-width: 3px; border-left-color: rgb(108, 226, 108); list-style: decimal-leading-zero outside; line-height: 18px; margin: 0px !important; padding: 0px 3px 0px 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;">                <span class="tag" style="margin: 0px; padding: 0px; border: none; color: rgb(153, 51, 0); font-weight: bold; background-color: inherit;"></</span><span class="tag-name" style="margin: 0px; padding: 0px; border: none; color: rgb(153, 51, 0); font-weight: bold; background-color: inherit;">list</span><span class="tag" style="margin: 0px; padding: 0px; border: none; color: rgb(153, 51, 0); font-weight: bold; background-color: inherit;">></span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;">  </span></span></li><li class="alt" style="border-style: none none none solid; border-left-width: 3px; border-left-color: rgb(108, 226, 108); list-style: decimal-leading-zero outside; color: inherit; line-height: 18px; margin: 0px !important; padding: 0px 3px 0px 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;">            <span class="tag" style="margin: 0px; padding: 0px; border: none; color: rgb(153, 51, 0); font-weight: bold; background-color: inherit;"></</span><span class="tag-name" style="margin: 0px; padding: 0px; border: none; color: rgb(153, 51, 0); font-weight: bold; background-color: inherit;">property</span><span class="tag" style="margin: 0px; padding: 0px; border: none; color: rgb(153, 51, 0); font-weight: bold; background-color: inherit;">></span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;">  </span></span></li><li style="border-style: none none none solid; border-left-width: 3px; border-left-color: rgb(108, 226, 108); list-style: decimal-leading-zero outside; line-height: 18px; margin: 0px !important; padding: 0px 3px 0px 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;">        <span class="tag" style="margin: 0px; padding: 0px; border: none; color: rgb(153, 51, 0); font-weight: bold; background-color: inherit;"></</span><span class="tag-name" style="margin: 0px; padding: 0px; border: none; color: rgb(153, 51, 0); font-weight: bold; background-color: inherit;">bean</span><span class="tag" style="margin: 0px; padding: 0px; border: none; color: rgb(153, 51, 0); font-weight: bold; background-color: inherit;">></span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;">  </span></span></li></ol></div>


添加包
jackson-mapper-asl-*.jar
jackson-core-asl-*.jar

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