1、第一種方式是spring2時代的產物，也就是每個json檢視controller配置一個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"/>

同樣要用jackson的jar包。

2、第二種使用JSON工具將物件序列化成json，常用工具Jackson，fastjson，gson。

利用HttpServletResponse，然後獲取response.getOutputStream()或response.getWriter()

直接輸出。

示例：

1. publicclass JsonUtil  
2. {  
3.     privatestatic Gson gson=new Gson();  
4.     /** 
5.      * @MethodName : toJson 
6.      * @Description : 將物件轉為JSON串，此方法能夠滿足大部分需求 
7.      * @param src 
8.      *            :將要被轉化的物件
    
9.      * @return :轉化後的JSON串 
10.      */
11.     publicstatic String toJson(Object src) {  
12.         if (src == null) {  
13.             return gson.toJson(JsonNull.INSTANCE);  
14.         }  
15.         return gson.toJson(src);  
16.     }  
17. }  

3、第三種利用spring mvc3的註解@ResponseBody

例如：

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.     return page.getResult();  
9.   }  

然後使用spring mvc的預設配置就可以返回json了，不過需要jackson的jar包哦。

注意：當springMVC-servlet.xml中使用<mvc:annotation-driven />時，如果是3.1之前已經預設注入AnnotationMethodHandlerAdapter，3.1之後預設注入RequestMappingHandlerAdapter只需加上上面提及的jar包即可!

如果是手動注入RequestMappingHandlerAdapter 可以這樣設定

配置如下：

<div class="dp-highlighter bg_html" style="font-family: Consolas, 'Courier New', Courier, mono, serif; font-size: 12px; width: 936.53125px; overflow: auto; padding-top: 1px; margin: 18px 0px !important;"><div class="bar" style="padding-left: 45px;"><div class="tools" style="padding: 3px 8px 10px 10px; font-stretch: normal; font-size: 9px; line-height: normal; font-family: Verdana, Geneva, Arial, Helvetica, sans-serif; color: silver; border-left-width: 3px; border-left-style: solid; border-left-color: rgb(108, 226, 108);"><strong>[html]</strong> <a target=_blank href="http://blog.csdn.net/shan9liang/article/details/42181345#" class="ViewSource" title="view plain" style="color: rgb(160, 160, 160); 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;">view plain</a><a target=_blank href="http://blog.csdn.net/shan9liang/article/details/42181345#" class="CopyToClipboard" title="copy" style="color: rgb(160, 160, 160); 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;">copy</a><a target=_blank href="http://blog.csdn.net/shan9liang/article/details/42181345#" class="PrintSource" title="print" style="color: rgb(160, 160, 160); 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;">print</a><a target=_blank href="http://blog.csdn.net/shan9liang/article/details/42181345#" class="About" title="?" style="color: rgb(160, 160, 160); 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 style="position: absolute; left: 600px; top: 1729px; width: 27px; height: 15px; z-index: 99;"></div></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>

新增包
jackson-mapper-asl-*.jar
jackson-core-asl-*.jar

原文：http://blog.csdn.net/shan9liang/article/details/42181345