json格式参数传递问题java.lang.String cannot be cast to com.alibaba.fastjson.JSONObject

[zhongzuo1981]

好好的json为啥被搞成连他自己都不认得了？？？

服务端代码：
@RequestMapping(value="/add", method = RequestMethod.POST, consumes="application/json")
public Boolean transcode(@RequestBody String reqStr){
try{
System.out.println(reqStr);
JSONObject jsonString = JSONObject.parseObject(reqStr);
System.out.println(jsonString);
}catch(Exception e){
e.printStackTrace();
}
return true;
}

测试用例
@Test
public void postJson() throws Exception{
Map<String, Object> map = new HashMap<String, Object>();
map.put("name", "张三");
map.put("pwd", "123");
String jsonString = JSON.toJSONString(map);
System.out.println(jsonString);
try{
String result = this.postJson("http://localhost:8002/dsp/add", jsonString);
System.out.println("result:"+result);
}catch(Exception e){
e.printStackTrace();
}
}

public String postJson(String url, String jsonBody) {
HttpHeaders headers = new HttpHeaders();
MediaType type = MediaType.parseMediaType("application/json; charset=UTF-8");
headers.setContentType(type);
headers.add("Accept", MediaType.APPLICATION_JSON.toString());
HttpEntity<String> formEntity = new HttpEntity<String>(jsonBody, headers);
return this.restTemplate.postForObject(url, formEntity, String.class);
}

服务端报错：
"{\"pwd\":\"123\",\"name\":\"张三\"}"
java.lang.ClassCastException: java.lang.String cannot be cast to com.alibaba.fastjson.JSONObject
at com.alibaba.fastjson.JSON.parseObject(JSON.java:221)
at com.xinhua.vms.controller.DspController.transcode(DspController.java:28)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205)
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:133)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:97)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:827)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:738)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:967)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:901)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:872)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:661)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:105)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:81)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:478)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:80)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:799)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:861)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1455)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:745)

[李德胜1995]

java.lang.ClassCastException: java.lang.String cannot be cast to com.alibaba.fastjson.JSONObject。。。类转换错误，String不能转为JSONObject。。。DspController的28行出错

[华丽丽的小低调]

后端可以返回自己拼接的类似json的字符串 {"pwd":"123","name":"张三"} 前端在进行转成json格式即可

[pengzhang130]

String json=StringEscapeUtils.unescapeHtml(data); 这样转义下

[zhongzuo1981]

自己顶 为啥呢

[lyn584238910]

map.put("name", "张三"); map.put("pwd", "123"); String jsonString = JSON.toJSONString(map);数据格式不对吧

[unclezh0730]

consumes="application/json"为什么写这个东西？我做的时候没写过这个哦 反斜线是转义的意思。 接口中的参数不写RequestBody试试呢？

[mmqw]

System.out.println(jsonString); 你的输出是： "{\"pwd\":\"123\",\"name\":\"张三\"}" 这里正常的输出应该是： {"pwd":"123","name":"张三"} 你的jsonString 可能是这样的 "\"{\\"pwd\\":\\"123\\",\\"name\\":\\"张三\\"}\" "

[尾号0505]

@RequestMapping(value="/add", method = RequestMethod.POST, consumes="application/json") @RequestBody public Boolean transcode(String reqStr){ try{ System.out.println(reqStr); JSONObject jsonString = JSONObject.parseObject(reqStr); System.out.println(jsonString); }catch(Exception e){ e.printStackTrace(); } return true; }

[尾号0505]

@RequestMapping(value="/add", method = RequestMethod.POST) @RequestBody public Boolean transcode(String reqStr){ try{ System.out.println(reqStr); JSONObject jsonString = JSONObject.parseObject(reqStr); System.out.println(jsonString); }catch(Exception e){ e.printStackTrace(); } return true; }

[qpalzm_favour]

单独解析带斜杠的字符串没有错，就是接受post请求的字符串报错

[G.Jagger]

这个不是 \ 的问题，而是你输出的数据最外层多了" "，还是数据拼接有问题