java代码怎么获取数字的证书那一串20位指纹？

通过JAVA来读取数字证书的方法获取20位指纹：

CARead.java文件代码：

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编码形式的信息", panelBase64)

/野姿* 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)

/* 以Base64编码颂庆绝形式读取证书文件的信息 */

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

Field=x509certificate.getNotBefore().toString()//得到开始有效日期

CA_ItemData[3][0] = "开始有效日期"

CA_ItemData[3][1] = Field

Field=x509certificate. getNotAfter().toString()//得到截止日期

CA_ItemData[4][0] = "截差槐止日期"

CA_ItemData[4][1] = Field

Field=x509certificate.getSerialNumber().toString(16)//得到序列号

CA_ItemData[5][0] = "序列号"

CA_ItemData[5][1] = Field

Field=x509certificate.getIssuerDN().getName()//得到发行者名

CA_ItemData[6][0] = "发行者名"

CA_ItemData[6][1] = Field

Field=x509certificate.getSigAlgName()//得到签名算法

CA_ItemData[7][0] = "签名算法"

CA_ItemData[7][1] = Field

Field=x509certificate.getPublicKey().getAlgorithm()//得到公钥算法

CA_ItemData[8][0] = "公钥算法"

CA_ItemData[8][1] = Field

//关闭输入流对象

file_inputstream.close()

final JTable table = new JTable(CA_ItemData, columnNames)

TableColumn tc = null//表格列控制

tc = table.getColumnModel().getColumn(1)//得到表头

tc.setPreferredWidth(600)//设置宽度

panel.add(table)//增加到布局面板

} catch (Exception exception) {

exception.printStackTrace()//异常捕获、

return -1

}

return 0

}

//读取二进制指纹文件

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()

X509Certificate cert=null

//遍历得到所有的证书属性

if (bais.available() >0)

{

cert = (X509Certificate) certificatefactory .generateCertificate(bais)

Cert_EditorPane.setText(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()

StringBuffer strBuffer =new StringBuffer()

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 = 1i <leni++) {

strBuffer.append(buf[i])

}

in.close()

Cert_EditorPane.setText(strBuffer.toString())

Cert_EditorPane.disable()

JScrollPane edit_scroll = new JScrollPane(Cert_EditorPane)

panel.add(edit_scroll)

} catch (Exception exception) {

exception.printStackTrace()

return -1

}

return 0

}

}

不会耶，应该需要什么硬件提槐昌慧供些接口什么的吧，然后把

指纹信息

放到数据库中铅答，刷的时候，获取指纹，然后拿到数据库中比较下。

如果，获得了迅颤指纹信息，那么其他的就没问题了。

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