在struts中从Angular 2发送和接收http post数据

我正在尝试将 http post 数据从 Angular 4 代码发送到 struts 操作。 Struts 操作正在被调用，但无法接收数据。给我一个错误“java.lang.ClassCastException：java.lang.Integer无法转换为java.lang.String”

建议会有很大帮助

    import { Component, OnInit } from '@angular/core';
import { Http, Headers, RequestOptions } from '@angular/http';
import 'rxjs/add/operator/toPromise';
import { Observable } from 'rxjs/Observable';
@Component({
  selector: 'app-root',
  template: '<h1>Dukes</h1>',
  // templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})

export class AppComponent implements OnInit {
  title = 'here beta';
  dukes = [{ name: "offline", age: 2 }];
  data = {
    title: 'foo',
    body: 'bar',
    userId: 1
  };
  headers: Headers = new Headers({ 'Content-Type': 'application/json' });
  options: RequestOptions = new RequestOptions({ headers: this.headers });
  constructor(private http: Http) { }

  ngOnInit() {
    let options = new RequestOptions();
    options.headers = new Headers();
    options.headers.append('Content-Type', 'application/json');
    const req = this.http.post('http://localhost:8080/SampleProject/getTutorial', this.data, options)
      .subscribe(
      res => {
        console.log(res);
      },
      err => {
        console.log("Error occured");
      }
      );

struts动作类是

    public class SampleAction {
   private String data;
 public String getData() {
            return data;
        }

        public void setData(String data) {
            this.data = data;
        }


    public int execute()
     {  
        try{
         actorSeqID = 3;
         System.out.println(data+"--");
        }catch(Exception e){
            e.printStackTrace();
        }


      return "success";
     }

如果你想得到data作为字符串那么你应该尝试像：

    import { Component, OnInit } from '@angular/core';
import { Http, Headers, RequestOptions } from '@angular/http';
import 'rxjs/add/operator/toPromise';
import { Observable } from 'rxjs/Observable';
@Component({
  selector: 'app-root',
  template: '<h1>Dukes</h1>',
  // templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})

export class AppComponent implements OnInit {
  title = 'here beta';
  dukes = [{ name: "offline", age: 2 }];
      data = "data=\"{title: 'foo',body: 'bar',userId: 1};\"";
  headers: Headers = new Headers({ 'Content-Type': 'application/x-www-form-urlencoded' });
  options: RequestOptions = new RequestOptions({ headers: this.headers });
  constructor(private http: Http) { }

  ngOnInit() {
    let options = new RequestOptions();
    options.headers = new Headers();
    options.headers.append('Content-Type', 'application/x-www-form-urlencoded');
    const req = this.http.post('http://localhost:8080/SampleProject/getTutorial', this.data, options)
      .subscribe(
      res => {
        console.log(res);
      },
      err => {
        console.log("Error occured");
      }
      );

但我认为你想通过 json 将它们全部设置为操作的不同属性，如果是这样，请定义 settertitle, body and userId在你的行动中并继续Struts JSON 插件 - JSON 拦截器 https://struts.apache.org/docs/json-plugin.html

另一个例子

import { Component, OnInit } from '@angular/core';
import { Http, Headers, RequestOptions } from '@angular/http';
import 'rxjs/add/operator/toPromise';
import { Observable } from 'rxjs/Observable';
@Component({
  selector: 'app-root',
  template: '<h1>Dukes</h1>',
  // templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})

export class AppComponent implements OnInit {
  title = 'here beta';
  dukes = [{ name: "offline", age: 2 }];
  data = {
    "title": "foo",
    "body": "bar",
    "userId": 1
  };
  headers: Headers = new Headers({ 'Content-Type': 'application/json' });
  options: RequestOptions = new RequestOptions({ headers: this.headers });
  constructor(private http: Http) { }

  ngOnInit() {
    let options = new RequestOptions();
    options.headers = new Headers();
    options.headers.append('Content-Type', 'application/json');
    const req = this.http.post('http://localhost:8080/SampleProject/getTutorial', JSON.stringify(this.data)/*CONVERTS DATA TO STRING*/, options)
      .subscribe(
      res => {
        console.log(res);
      },
      err => {
        console.log("Error occured");
      }
      );

    public class SampleAction {
   private String title;
 public String getTitle() {
            return title;
        }

        public void setTitle(String title) {
            this.title = title;
        }
   private String body;
 public String getBody() {
            return body;
        }

        public void setBody(String body) {
            this.body= body;
        }
   private int userId;
 public String getUserId() {
            return userId;
        }

        public void setUserId(int userId) {
            this.userId= userId;
        }


    public int execute()
     {  
        try{
         actorSeqID = 3;
         System.out.println(data+"--");
        }catch(Exception e){
            e.printStackTrace();
        }


      return actorSeqID;
     }

<package name="default" namespace="/" extends="struts-default,json-default">
        <action name="getTutorial" method="execute" class="SampleAction">
            <interceptor-ref name="json"></interceptor-ref>
        </action>
</package>