用Tomcat构建一个简单图片服务器

  • Z时代
  • 2024-01-10
  • 分类：综合

编程

<Context docBase="C:exambase" path="/img"/>

方法二：添加Servlet

新建一应用，然后添加如下的Servlet，然后部署应用并启动Tomcat。

package com.lun.servlet;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
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 = "imgservlet", urlPatterns = { "/imgservlet/*" })
public class ImgServlet extends HttpServlet {
	private static final long serialVersionUID = -3351976768417931566L;
	private static final String IMG_PATH = "C:/exambase";
	protected void doGet(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		doPost(request, response);
	}
	protected void doPost(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		String pathInfo = request.getPathInfo();
		try{
			BufferedInputStream in = new BufferedInputStream(new FileInputStream(String.format("%s%s", IMG_PATH, pathInfo)));
			BufferedOutputStream out = new BufferedOutputStream(response.getOutputStream());
			try {
				byte[] content = new byte[in.available()];
				in.read(content);
				response.setContentType("image/png,image/jpeg,image/gif,image/bmp");
				out.write(content);
			}finally {
				in.close();
				out.close();
			}
		}catch(FileNotFoundException ex) {
			throw new IOException(String.format("%s Not Found.", pathInfo));
		}catch(Exception ex) {
			throw ex;			
		}
	}
}

解决路径含中文时出现乱码问题

本次测试使用的是Tomcat/7.0.90，默认解码URL的字符集是ISO-8859-1，而浏览器发出URL是用UTF-8编码。若URL含中文，乱码现象自然而然会发生。

解决之道：在TOMCAT_HOME/conf/server.xml配置文件内的

<Connector connectionTimeout="20000" port="8080"
	 protocol="HTTP/1.1" redirectPort="8443" />

添加一属性URIEncoding="UTF-8"。

参考资料

  1. tomcat做服务器" title="图片服务器">图片服务器

  2. 使用Servlet显示图片

  3. Java Servlet @WebServlet Annotation Example

  4. Servlet and path parameters like /xyz/{value}/test, how to map in web.xml?

  5. 关于使用Tomcat搭建的Web项目，出现 URL 中文乱码的问题解析

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