背景:WebGIS Demo1选择要素并下载shp文件到本地
完整Demo:https://blog.csdn.net/summer_dew/article/details/80712591
功能:使用Servlet搭建自己的HTTP服务
- 在 Eclipse 中创建项目 File > New > Project > Web > Dynamic Web Project,并选择 Apache Tomcat作为网络服务器;
- 创建 Java Servlet,右键 project > New > Other > Web > Servelt,输入 Servlet的名称为 DonwloadFileServlet;
- 若有报错,需要手动加入Servlet包Build Path > Configure Build Path > 定位到tomcat/lib下 > servlet-api.jar
- 将下面的代码替换新建的 Servlet 中的代码:
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// 填写你的业务逻辑
response.getOutputStream().println("get");
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// 填写你的业务逻辑
// 这里以WebGIS Demo1的业务逻辑为例
String zippath = request.getParameter("zippath");
System.out.println(zippath);
File file = new File(zippath.trim() );
response.setContentType("application/octet-stream");
response.setHeader("Content-Disposition","attachment;filename=" + file.getName() );
response.setContentLength((int) file.length());
FileInputStream fis = null;
try {
fis = new FileInputStream(file);
byte[] buffer = new byte[128];
int count = 0;
while ((count = fis.read(buffer)) > 0) {
response.getOutputStream().write(buffer, 0, count);
}
} catch (Exception e) {
e.printStackTrace();
} finally {
response.getOutputStream().flush();
response.getOutputStream().close();
fis.close();
}
}
- 右键 Servlet project > Run as > Run on Server,选择 “Manually define a newserver” 并指定 Apache Tomcat 的安装目录,然后打开 web 浏览器并输入
http://localhost:8080/DonwloadFileServlet/DownloadFileServlet
网页访问是get模式,所以可以看到以下页面:
关于网址:http://localhost:8080/项目名/WebServlet后的字符串
此例子:http://localhost:8080/DonwloadFileServlet/DownloadFileServlet
@WebServlet("/DownloadFileServlet")
public class DownloadFileServlet extends HttpServlet {
...
}