使用Servlet显示图片

最新推荐文章于 2024-07-31 14:09:16 发布

原创最新推荐文章于 2024-07-31 14:09:16 发布 · 235 阅读

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本文介绍了一个使用Servlet处理HTTP请求并展示图片的程序代码。通过获取应用上下文的真实路径，程序能够读取指定图片文件，并将其作为JPEG类型响应发送给客户端。

程序代码

package org.fool.servlet;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.FileInputStream;
import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@WebServlet(name = "showimageservlet", urlPatterns = { "/showimageservlet" })
public class ShowImageServlet extends HttpServlet {

	protected void doGet(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		doPost(request, response);
	}

	protected void doPost(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		String path = request.getServletContext().getRealPath("/images");
		
		response.setContentType("image/jpeg");

		BufferedInputStream in = new BufferedInputStream(new FileInputStream(
				path + "/books.jpg"));
		byte[] content = new byte[in.available()];

		in.read(content);
		in.close();

		BufferedOutputStream out = new BufferedOutputStream(
				response.getOutputStream());

		out.write(content);
		out.close();
	}
}