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 >
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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);
}
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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" );
}
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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;
}
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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 >
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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" );
}
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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;
}
}
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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 >
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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