struts项目向前台返回图片。

读取项目路径WebRoot下的图片

编写action

package com.sadj.market.action;

import java.io.BufferedInputStream;

import java.io.ByteArrayInputStream;

import java.io.ByteArrayOutputStream;

import java.io.FileInputStream;

import java.io.IOException;

import javax.servlet.http.HttpServletRequest;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;

import com.opensymphony.xwork2.util.logging.Logger;

import com.opensymphony.xwork2.util.logging.LoggerFactory;

public class PublicAction extends ActionSupport{

    //定义输出到前台的输出流

    private ByteArrayInputStream imageStream;  

    private Logger logger=LoggerFactory.getLogger(Public.class);

    private static final long serialVersionUID = 1L;

    public String image() throws IOException{

        HttpServletRequest request = ServletActionContext.getRequest();

        //获取webroot下的文件

        String path   =   request.getSession().getServletContext().getRealPath("/")+"statics\\x.jpg";

        System.out.println(path);

        //创建文件输入流

        FileInputStream fis = new  FileInputStream(path);

        //放入bufferedInputStream

        BufferedInputStream bis=new BufferedInputStream(fis);

        //定义ByteArrayOutStream

        ByteArrayOutputStream output = new ByteArrayOutputStream(); 

        int c=bis.read();//读取bis流中的下一个字节

        while(c!=-1){

            output.write(c);

            c=bis.read();

        }

        bis.close();

        imageStream = new ByteArrayInputStream(output.toByteArray());

        return SUCCESS;

    }

    public ByteArrayInputStream getImageStream() {

        return imageStream;

    }

    public void setImageStream(ByteArrayInputStream imageStream) {

        this.imageStream = imageStream;

    }

}

编写struts.xml

<action name="image" class="com.sadj.market.action.PublicAction" method="image">

            <result name="success" type="stream">

                <param name="contentType">image/jpeg</param>

                <param name="inputName">imageStream</param>

                <param name="bufferSize">2048</param>

            </result>

      </action>

前台直接访问image这个action即可

struts项目向前台返回图片。的相关教程结束。