错误：JSON.parse：来自Json的JSON数据的第1行第1列的意外字符

Question

我坚持这个错误。我也检查了其他类似的问题。我有一个简单的angularjs / spring应用程序。请求提供200，但我在开发人员工具/ firebug中收到响应的JSON解析异常。服务器的响应是一个简单的字符串，我能够看到。我怀疑问题是angular将它解析为JSON。请帮帮我。

角度控制器：

var loginApp = angular.module('loginApp',[]);
loginApp.controller('loginController', ['$scope','$http',function($scope,$http) {

  $scope.login = function(isValid) {
      if(isValid){
          var formData= {"username":$scope.username,"password":$scope.password};
          $http.post('/suite/rest/dologin',formData).success(function(response){
              console.log(response);
              alert(response);
          });
      }
  };
}]);

Spring控制器：

@RequestMapping(value = "/dologin", method = RequestMethod.POST)
public @ResponseBody String doLogin(@RequestBody final User user) {

    String validateUser = "admin";

    return validateUser;
}

错误消息：

Error: JSON.parse: unexpected character at line 1 column 1 of the JSON data
fromJson@http://localhost:8080/suite/extResources/Angular/angular.js:1352:9
defaultHttpResponseTransform@http://localhost:8080/suite/extResources/Angular/angular.js:10455:1
transformData/<@http://localhost:8080/suite/extResources/Angular/angular.js:10546:12
forEach@http://localhost:8080/suite/extResources/Angular/angular.js:322:11
transformData@http://localhost:8080/suite/extResources/Angular/angular.js:10545:3
transformResponse@http://localhost:8080/suite/extResources/Angular/angular.js:11343:21
processQueue@http://localhost:8080/suite/extResources/Angular/angular.js:16104:28
scheduleProcessQueue/<@http://localhost:8080/suite/extResources/Angular/angular.js:16120:27
$RootScopeProvider/this.$get</Scope.prototype.$eval@http://localhost:8080/suite/extResources/Angular/angular.js:17378:16
$RootScopeProvider/this.$get</Scope.prototype.$digest@http://localhost:8080/suite/extResources/Angular/angular.js:17191:15
$RootScopeProvider/this.$get</Scope.prototype.$apply@http://localhost:8080/suite/extResources/Angular/angular.js:17486:13
done@http://localhost:8080/suite/extResources/Angular/angular.js:11637:36
completeRequest@http://localhost:8080/suite/extResources/Angular/angular.js:11843:7
requestLoaded@http://localhost:8080/suite/extResources/Angular/angular.js:11776:1

用户类：

public class User implements Serializable {
    @JsonProperty
    private String username;

    @JsonProperty
    private String password;

    public User(){

    }

    public User(String username, String password){
        this.username = username;
        this.password = password;
    }

    public String getUsername() {
        return username;
    }
    public void setUsername(String username) {
        this.username = username;
    }
    public String getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }


}

Answer 1

您可以使用请求中的config object显式设置响应类型。这将覆盖响应标题中Content-Type所假设的处理。

$http.post('/suite/rest/dologin',formData,{responseType:'text'})

最终，解决方案是更改服务器端，以便它不会在标头中返回Content-Type: application/json的响应。

Answer 2

字符串json不是有效的String validateUser = {"id": "admin"} ，因此解析它会引发错误

尝试返回类似的内容：

{{1}}