实例代码：
index.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>$Title$</title>
</head>
<body>
<form action="download" method="post">
<input type="text" name="name">
<input type="submit" value="提交">
</form>
</body>
</html>
inputStreamServlet.java
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
@WebServlet(name = "Servlet",urlPatterns = "/download")
public class inputStreamServlet extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String name = request.getParameter("name");
if(name.equals("name")){
response.setContentType("application/pdf");//设置显示内容类型
InputStream in = getServletContext().getResourceAsStream("/WEB-INF/a.pdf");//获得输入流
OutputStream out = response.getOutputStream();//取得输出流
writeBytes(in,out);//读取文件并显示在浏览器
}
}
//writeBytes()构造方法
private void writeBytes(InputStream in, OutputStream out) throws IOException {
byte[] buffer= new byte[1024];
int length = -1;
while ((length = in.read(buffer))!=-1){
out.write(buffer,0,length);
}
in.close();
out.close();
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
}
}
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