cert2str.java

package dcec.rdd;

import java.io.FileInputStream;
import java.io.IOException;
import java.net.URLEncoder;

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

import sun.misc.BASE64Encoder;

public class TestCert extends HttpServlet {

	/**
	 * Constructor of the object.
	 */
	public TestCert() {
		super();
	}

	/**
	 * Destruction of the servlet. <br>
	 */
	public void destroy() {
		super.destroy(); // Just puts "destroy" string in log
		// Put your code here
	}

	/**
	 * The doGet method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to get.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

	}

	/**
	 * The doPost method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to post.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		String type=request.getParameter("type");
		//获得根证书的文件目录
		String rootPath=this.getServletContext().getRealPath("/");
		if(type.equals("root")){//表示安装根证书
			rootPath+="cert\\dcec1D.cer";
		}else if(type.equals("sign")){//表示安装数字签名证书
			rootPath+="cert\\dcec1D.cer";
		}
		
		//读取跟证书
		
		FileInputStream inUserCert=new FileInputStream(rootPath);//文件输入流，采用二进制的方式读取
		int len=inUserCert.available();//获取证书总长度
		byte[] userCert=new byte[len];//声明一个byte类型的数组，长度为证书的长度
		inUserCert.read(userCert);//将证书读取到byte里
		inUserCert.close();//关闭输入流
		
		BASE64Encoder encoder=new BASE64Encoder();//声明一个编码器
		String strCert=encoder.encode(userCert);//对证书进行编码
		
		//对证书进行组装，使其可以为脚本安装所使用
		strCert="-----BEGIN CERTIFICATE-----"+strCert;//添加证书标识的头部和尾部
		strCert+="-----END CERTIFICATE-----";		
		
		//刚才读取的证书内容
		response.setContentType("application/x-pkcs7-certificates");
		response.addHeader("Content-Disposition", "attachment;filename="+URLEncoder.encode("苏州市数字城市工程研究中心有限公司","UTF-8"));
		response.getOutputStream().write(userCert);
		response.getOutputStream().flush();
		response.getOutputStream().close();
	}

	/**
	 * Initialization of the servlet. <br>
	 *
	 * @throws ServletException if an error occurs
	 */
	public void init() throws ServletException {
		// Put your code here
	}

}