如果要以data字符串形式获取，则应尝试如下操作：

    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");
      }
      );

但我认为您想通过json将它们全部设置为不同的动作属性，如果是，请定义的setter
title，body然后userId在您的动作中继续使用Struts JSON插件-
JSON拦截器

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>