Spring mvc处理json需要使用jackson的类库,因此为支持json格式的输入输出需要先修改pom.xml增加jackson包的引用
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<!-- json --> < dependency > < groupId >org.codehaus.jackson</ groupId > < artifactId >jackson-core-lgpl</ artifactId > < version >1.8.1</ version > </ dependency > < dependency > < groupId >org.codehaus.jackson</ groupId > < artifactId >jackson-mapper-lgpl</ artifactId > < version >1.8.1</ version > </ dependency > |
先修改之前的helloworld.jsp,增加客户端json格式的数据输入。
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var cfg = { type: 'POST' , data: JSON.stringify({userName: 'winzip' ,password: 'password' ,mobileNO: '13818881888' }), dataType: 'json' , contentType: 'application/json;charset=UTF-8' , success: function (result) { alert(result.success); } }; function doTestJson(actionName){ cfg.url = actionName; $.ajax(cfg); } |
根据前面的分析,在spring mvc中解析输入为json格式的数据有两种方式 1:使用@RequestBody来设置输入
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@RequestMapping ( "/json1" ) @ResponseBody public JsonResult testJson1( @RequestBody User u){ log.info( "get json input from request body annotation" ); log.info(u.getUserName()); return new JsonResult( true , "return ok" ); } |
2:使用HttpEntity来实现输入绑定
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@RequestMapping ( "/json2" ) public ResponseEntity<JsonResult> testJson2(HttpEntity<User> u){ log.info( "get json input from HttpEntity annotation" ); log.info(u.getBody().getUserName()); ResponseEntity<JsonResult> responseResult = new ResponseEntity<JsonResult>( new JsonResult( true , "return ok" ),HttpStatus.OK); return responseResult; } |
Json格式的输出也对应有两种方式 1:使用@responseBody来设置输出内容为context body 2:返回值设置为ResponseEntity<?>类型,以返回context body 另外,第三种方式是使用ContentNegotiatingViewResolver来设置输出为json格式,需要修改servlet context配置文件如下
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< bean class = "org.springframework.web.servlet.view.ContentNegotiatingViewResolver" > < property name = "order" value = "1" /> < property name = "mediaTypes" > < map > < entry key = "json" value = "application/json" /> </ map > </ property > < property name = "defaultViews" > < list > < bean class = "org.springframework.web.servlet.view.json.MappingJacksonJsonView" /> </ list > </ property > < property name = "ignoreAcceptHeader" value = "true" /> </ bean > |
但这种格式的输出会返回{model类名:{内容}} 的json格式, 例如,以下代码
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@RequestMapping ( "/json3.json" ) public JsonResult testJson3( @RequestBody User u){ log.info( "handle json output from ContentNegotiatingViewResolver" ); return new JsonResult( true , "return ok" ); } |
期望的返回是 {success:true,message:”return ok”}; 但实际返回的却是 {"jsonResult":{"success":true,"msg":"return ok"}} 原因是MappingJacksonJsonView中对返回值的处理未考虑modelMap中只有一个值的情况,直接是按照mapName:{mapResult}的格式来返回数据的。 修改方法,重载MappingJacksonJsonView类并重写filterModel方法如下
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protected Object filterModel(Map<String, Object> model) { Map<?, ?> result = (Map<?, ?>) super .filterModel(model); if (result.size() == 1 ) { return result.values().iterator().next(); } else { return result; } } |
对应的ContentNegotiatingViewResolver修改如下
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< bean class = "org.springframework.web.servlet.view.ContentNegotiatingViewResolver" > < property name = "order" value = "1" /> < property name = "mediaTypes" > < map > < entry key = "json" value = "application/json" /> </ map > </ property > < property name = "defaultViews" > < list > < bean class = "net.zhepu.json.MappingJacksonJsonView" /> </ list > </ property > < property name = "ignoreAcceptHeader" value = "true" /> </ bean > |
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。
原文链接:http://www.cnblogs.com/crazy-fox/archive/2012/02/18/2357688.html