Struts2 直接输出字符 type="stream"

1. 用json 不能解决的问题

 

有时我们用java 把json 对象用字符串拼接好后

1) 定义一个inputstream 

2)定义Action

 

 

package com.bs023.msvs.action;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import org.apache.struts2.ServletActionContext;

/**
 * 测试Action
 * @author liuqing
 * @version 1.0
 */
public class TestAction {
	
	private String username;
	
	private String password;
	
	//写一个输出流
	private InputStream json;
	
	public String add() {
		try {
		    //中文转码问题
			this.username = "username _=======222==刘庆==qing";
			this.json = new ByteArrayInputStream(this.username.getBytes());
		} 
		catch (Exception e) {
			e.printStackTrace();
		}
		return "add";
	}
	
	public OutputStream output() throws IOException {
		return ServletActionContext.getResponse().getOutputStream();
	}

	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;
	}

	public InputStream getJson() {
		return json;
	}

	public void setJson(InputStream json) {
		this.json = json;
	}

}

 

2.配置文件

 

 <action name="test" class="testAction" method="add">
       		<result name="add" type="stream">
       		    <param name="contentType">text/html;charset=UTF-8</param>
       			<param name="inputName">json</param>
       		</result>
       </action>

 

 

3. 运行结果

 

http://127.0.0.1:8080/upsn/usermanager/test.action

 

 

username _=======222==刘庆==qing

 

 

4.方法二使用ServletActionContext

 

 

package com.bs023.msvs.action;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;

import javax.servlet.http.HttpServletResponse;

import org.apache.struts2.ServletActionContext;

/**
 * 测试Action
 * @author liuqing
 * @version 1.0
 */
public class TestAction {
	
	private String username;
	
	private String password;
	
	//写一个输出流
	private InputStream json;
	
	public String add() {
		try {
			
			PrintWriter out = new PrintWriter(this.output());
			out.println("我是中国人");
			out.flush();
		} catch (IOException e) {
			e.printStackTrace();
		}
		return null;
	}
	
	public OutputStream output() throws IOException {
		//通过struts2 调用Response
		HttpServletResponse reponse = ServletActionContext.getResponse();
		reponse.setContentType("text/html;charset=UTF-8");
		return reponse.getOutputStream();
	}

	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;
	}

	public InputStream getJson() {
		return json;
	}

	public void setJson(InputStream json) {
		this.json = json;
	}

}