package servlet; import java.io.File; import java.io.FileInputStream; import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; /** * 案例- content-Type作用 * @author Administrator * */ public class ResponseDemo4 extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { /* * 设置响应实体内容编码 */ response.setCharacterEncoding("utf-8"); /* * 1. 服务器发送给浏览器的数据类型和内容编码 */ // response.setHeader("content-type", "text/html"); response.setContentType("text/html; charset=utf-8");//和上面代码等价。推荐使用此方法 //response.getWriter().write("<html><head><title>this is tilte</title></head><body>中国</body></html>"); response.getOutputStream().write("<html><head><title>this is tilte</title></head><body>中国</body></html>".getBytes("UTF-8")); File file = new File("D:\linux\files Structure.png"); // 设置以 下载 方式打开文件 response.setHeader("content-Disposition", "attachment; filename=" + file.getName()); // 发送图片 FileInputStream in = new FileInputStream(file); byte[] buf = new byte[1024]; int len = 0; // 把图片内容写出到浏览器 while ( (len = in.read(buf)) != -1) { response.getOutputStream().write(buf, 0, len); } } }