CARead.java

package com.e2u.ca;

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.table.*;
import java.security.cert.CertificateFactory;
import java.security.cert.X509Certificate;
import java.io.*;

public class CARead extends JPanel {
	private String CA_Name;
	private String CA_ItemData[][] = new String[9][2];
	private String[] columnNames = { "证书字段标记", "内容" };

	public CARead(String CertName) {
		CA_Name = CertName;
		/* 三个Panel用来显示证书内容 */
		JTabbedPane tabbedPane = new JTabbedPane();
		JPanel panelNormal = new JPanel();
		tabbedPane.addTab("普通信息", panelNormal);
		JPanel panelAll = new JPanel();
		panelAll.setLayout(new BorderLayout());
		tabbedPane.addTab("所有信息", panelAll);
		JPanel panelBase64 = new JPanel();
		panelBase64.setLayout(new BorderLayout());
		tabbedPane.addTab("Base64编码信息", panelBase64);
		/* 读取证书常规信息 */
		Read_Normal(panelNormal);
		/* 读取证书文件字符串表示内容 */
		Read_Bin(panelAll);
		/* 读取证原始Base64编码形式的证书文件 */
		Read_Raw(panelBase64);
		tabbedPane.setSelectedIndex(0);
		setLayout(new GridLayout(1, 1));
		add(tabbedPane);
	}

	private int Read_Normal(JPanel panel) {
		String Field;
		try {
			CertificateFactory certificate_factory = CertificateFactory
					.getInstance("X.509");
			FileInputStream file_inputstream = new FileInputStream(CA_Name);
			X509Certificate x509certificate = (X509Certificate) certificate_factory
					.generateCertificate(file_inputstream);
			Field = x509certificate.getType();
			CA_ItemData[0][0] = "类型";
			CA_ItemData[0][1] = Field;
			Field = Integer.toString(x509certificate.getVersion());
			CA_ItemData[1][0] = "版本";
			CA_ItemData[1][1] = Field;
			Field = x509certificate.getSubjectDN().getName();
			CA_ItemData[2][0] = "标题";
			CA_ItemData[2][1] = Field;
			/*
			 * 以下类似，这里省略
			 * Field=x509certificate.getNotBefore().toString();得到开始有效日期
			 * Field=x509certificate. getNotAfter().toString();得到截止日期
			 * Field=x509certificate.getSerialNumber().toString(16);得到序列号
			 * Field=x509certificate.getIssuerDN().getName();得到发行者名
			 * Field=x509certificate.getSigAlgName();得到签名算法
			 * Field=x509certificate.getPublicKey().getAlgorithm();得到公钥算法
			 */
			file_inputstream.close();
			final JTable table = new JTable(CA_ItemData, columnNames);
			TableColumn tc = null;
			tc = table.getColumnModel().getColumn(1);
			tc.setPreferredWidth(600);
			panel.add(table);
		} catch (Exception exception) {
			exception.printStackTrace();
			return -1;
		}
		return 0;
	}

	private int Read_Bin(JPanel panel) {
		try {
			FileInputStream file_inputstream = new FileInputStream(CA_Name);
			DataInputStream data_inputstream = new DataInputStream(
					file_inputstream);
			CertificateFactory certificatefactory = CertificateFactory
					.getInstance("X.509");
			byte[] bytes = new byte[data_inputstream.available()];
			data_inputstream.readFully(bytes);
			ByteArrayInputStream bais = new ByteArrayInputStream(bytes);
			JEditorPane Cert_EditorPane;
			Cert_EditorPane = new JEditorPane();
			while (bais.available() > 0) {
				X509Certificate Cert = (X509Certificate) certificatefactory
						.generateCertificate(bais);
				Cert_EditorPane.setText(Cert_EditorPane.getText()
						+ Cert.toString());
			}
//			Cert_EditorPane.disable();
			JScrollPane edit_scroll = new JScrollPane(Cert_EditorPane);
			panel.add(edit_scroll);
			file_inputstream.close();
			data_inputstream.close();
		} catch (Exception exception) {
			exception.printStackTrace();
			return -1;
		}
		return 0;
	}

	private int Read_Raw(JPanel panel) {
		try {
			JEditorPane Cert_EditorPane = new JEditorPane();
			Cert_EditorPane.setCaretColor(Color.RED);
			String CertText = null;
			File inputFile = new File(CA_Name);
			FileReader in = new FileReader(inputFile);
			char[] buf = new char[2000];
			int len = in.read(buf, 0, 2000);
			for (int i = 1; i < len; i++) {
				CertText = CertText + buf[i];
			}
			in.close();
			Cert_EditorPane.setText(CertText);
			Cert_EditorPane.disable();
			JScrollPane edit_scroll = new JScrollPane(Cert_EditorPane);
			panel.add(edit_scroll);
		} catch (Exception exception) {
			exception.printStackTrace();
			return -1;
		}
		return 0;
	}

	public static void main(String[] args) {
		JFrame frame = new JFrame("证书阅读器");
		frame.addWindowListener(new WindowAdapter() {
			public void windowClosing(WindowEvent e) {
				System.exit(0);
			}
		});
		frame.getContentPane().add(new CARead("mycert.crt"),
				BorderLayout.CENTER);
		frame.setSize(700, 425);
		frame.setVisible(true);
	}
	/* 以下是定义的Read_Normal()，Read_Bin(),Read_Raw()以及main() 这里省略... */
}