java的图片回显问题(从本地磁盘读取文件并显示到页面上)

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页面上读取服务器的图片分为两种方式:

1.读取tomcat或者项目webapp/目录下图片。

2.读取本地磁盘的图片文件,如:d:/image/1.jpg


1.读取tomcat或者项目webapp目录下图片。

这类问题比较简单,
前端页面代码:

<img id="fileTeacherTwo" src="/skillsCompetitionPlatform/userfiles/1/images/1.jpg" alt="" style="height: 60px">
												// 项目名/webapp下文件目录名/图片文件名

2.读取本地磁盘的图片文件,如:d:/image/1.jpg

jsp代码:

<img id="fileTeacherTwo" src="${ctx}/basedata/image/toFindImg?imgUrl=${teacherEnroll.teacherDetail.fileTeacherTwo}" alt="" style="height: 60px">
 // ${teacherEnroll.teacherDetail.fileTeacherTwo}    得到是文件在磁盘的位置如:d:/image/1.jpg        

后台controller:

import com.cnony.core.web.BaseController;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.BufferedOutputStream;
import java.io.FileInputStream;
import java.io.OutputStream;

/**
  *@业务描述: 图片回显通用controller
  */  
@Controller
@RequestMapping(value = "${adminPath}/basedata/image")
public class ImageController extends BaseController{

	/**
	 * @param imgUrl 图片在本地磁盘的位置 如:E:/teacherCompetition/1/images/1.jpg
	 * @param request
	 * @param response
	 */
	@RequestMapping("/toFindImg")
	public void picToJSP(@RequestParam("imgUrl") String imgUrl, HttpServletRequest request, HttpServletResponse response){
		FileInputStream in;
		response.setContentType("application/octet-stream;charset=UTF-8");
		try {
			//图片读取路径
			in=new FileInputStream(imgUrl);
			int i=in.available();
			byte[]data=new byte[i];
			in.read(data);
			in.close();
			//写图片
			OutputStream outputStream=new BufferedOutputStream(response.getOutputStream());
			outputStream.write(data);
			outputStream.flush();
			outputStream.close();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}


}


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转载自blog.csdn.net/weter_drop/article/details/90474269