【www.bbyears.com--常见问题】
java模拟https登陆
首先我要登陆，然后保存cookie，然后利用cookie来访问后续的网页，发包，处理包这样，然后，为了方便，我选择了 org.apache.http 这个库，典型的一个登陆场景应该是这样的，以后遇到问题一定先要去看官方的例子，别人给出的例子一般要么是不能用，要么是用的方法都是一些过时的，虽然能用，但看到警告还是不舒服。
public static BasicCookieStore cookieStore;
//整个过程用一个client
public static CloseableHttpClient httpclient;
cookieStore = new BasicCookieStore();
httpclient = HttpClients.custom().setDefaultCookieStore(cookieStore).build();
//先访问一下首页，然后cookie、会填充进来
HttpGet httpget = new HttpGet(“https://leaver.me/index.htm“);
httpclient.execute(httpget);
CloseableHttpResponse responseCookie = null;
//然后post请求登陆
HttpPost httpost = new HttpPost(“https://leaver.me/login.htm“);
//通过键值对来作为post参数
List < NameValuePair > nameValuePairs = new ArrayList < NameValuePair > (1);
nameValuePairs.add(new BasicNameValuePair(“loginType”, “1”));
nameValuePairs.add(new BasicNameValuePair(“loginName”, username));
nameValuePairs.add(new BasicNameValuePair(“Password”, password));
httpost.setEntity(new UrlEncodedFormEntity(nameValuePairs, Consts.UTF_8));
CloseableHttpResponse responLogin = null;
responLogin = httpclient.execute(httpost);
但是，这个过程报了如下的错
e: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
google之，发现时访问https的原因。需要先安装对应站点的证书。这里要用到一个通用的java类，我贴下链接
编译这个工具类，然后执行java InstallCert
然后在项目里通过
System.setProperty(“javax.net.ssl.trustStore”,
“证书路径”);
设置即可，你可以吧证书文件放到资源目录，就更好了。
java正则替换反斜线
我在某个地方需要把字符串里的所有反斜线替换成两个，我就写了
str.replaceAll(““,”“)
结果发现我还是too young,实际上，
java replaceAll() 方法要用 4 个反斜杠,表示一个反斜杠 例如
str1=”aabbb”;
要想替换成
str1=”aabbb”;
必须这样替换：
str1 = str1.replaceAll(““, “\“);
原因如下： String 的 replaceAll（） 方法，实际是采用正则表达式的规则去匹配的， ，java解析为交给正则表达式， 正则表达式再经过一次转换，把转换成为 也就是java里面要用正则来表示一个. 必须写成4个 如果要表示，那就要写8个 所以如果写成： str1 = str1.replaceAll(““, ““); 就会报正则表达式的错误。
httpClient如何模拟表单上传文件
这个还是要去看官方例子，网上没找到，需要添加
org.apache.http.entity包
//文件部分
FileBody csvFile = null;
//表单的其他部分
StringBody filelog = null;
StringBody dataItemDefine = null;
csvFile = new FileBody(new File(file));
filelog = new StringBody(“ADD”, ContentType.TEXT_PLAIN);
dataItemDefine = new StringBody(GlobalSetting.getValueOfKey(type), ContentType.TEXT_PLAIN);
//关键代码,此处来构造请求数据
HttpEntity reqEntity = MultipartEntityBuilder.create().addPart(“filelog”, changeLogAction).addPart(“dataItemDefine”, dataItemDefine).addPart(“fileName”, csvFile).build();
HttpPost httppost = new HttpPost(“https://leaver.me/uploadFile.action“);
httppost.setEntity(reqEntity);
CloseableHttpResponse response = null;
response = httpclient.execute(httppost);
其他都和普通的post请求没啥区别了
json-lib的一个问题
在maven里添加了json-lib的依赖后，启动报错
missing net.sf.json-lib，但实际上这个我的确是加载进来了。去了SO，才知道，还需要知道classifier 依赖，把jdk的版本添加上就行。这个应该是我当时添加的时候没有去maven中央库填写造成的
json-lib
maven生成可执行jar包
写好的工具要打包，需要在pom文件，（我用mave来管理）里添加如下的配置
maven-assembly-plugin
false
然后在工程目录执行
mvn assembly:assembly
就会在target目录生成jar包啦
java调用webservice
有一些已有的webservice服务，由xfire生成发布，有些有参数，有些无参数，无参数的直接我直接使用org.codehaus.xfire这个包里的Client来动态生成客户端。然后调用就可以了。非常简单
Client client = null;
try {
client = new Client(
new URL(
“http://leaver.me/testService?wsdl“));
client.invoke(“refreshAllCache”, new Object[0]);
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
但对于有参的，且是服务器自定义的类作为参数的时候，实在是搞不定。。不管是把自定义的类放到本地，包名一致，在invoke的时候生成这个对象还是其他什么方法。都无法完成。
最终换了直接发送soap报文来完成。dirty hack啊。如果你有一些好的方法希望不吝赐教。
解决方案来源自stackoverflow，因为stackoverflow现在国内好像有时候打不开。因此把代码贴过来。有疑问的话留言讨论。
import javax.xml.soap.;
import javax.xml.transform.;
import javax.xml.transform.stream.*;
public class SOAPClientSAAJ {
/**
* Starting point for the SAAJ - SOAP Client Testing
*/
public static void main(String args[]) {
try {
// Create SOAP Connection
SOAPConnectionFactory soapConnectionFactory = SOAPConnectionFactory.newInstance();
SOAPConnection soapConnection = soapConnectionFactory.createConnection();
// Send SOAP Message to SOAP Server
String url = "http://ws.cdyne.com/emailverify/Emailvernotestemail.asmx";
SOAPMessage soapResponse = soapConnection.call(createSOAPRequest(), url);
// Process the SOAP Response
printSOAPResponse(soapResponse);
soapConnection.close();
} catch (Exception e) {
System.err.println("Error occurred while sending SOAP Request to Server");
e.printStackTrace();
}
}
private static SOAPMessage createSOAPRequest() throws Exception {
MessageFactory messageFactory = MessageFactory.newInstance();
SOAPMessage soapMessage = messageFactory.createMessage();
SOAPPart soapPart = soapMessage.getSOAPPart();
String serverURI = "http://ws.cdyne.com/";
// SOAP Envelope
SOAPEnvelope envelope = soapPart.getEnvelope();
envelope.addNamespaceDeclaration("example", serverURI);
/*
Constructed SOAP Request Message:
<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:example="http://ws.cdyne.com/">
<SOAP-ENV:Header/>
<SOAP-ENV:Body>
<example:VerifyEmail>
<example:email>mutantninja@gmail.com</example:email>
<example:LicenseKey>123</example:LicenseKey>
</example:VerifyEmail>
</SOAP-ENV:Body>
</SOAP-ENV:Envelope>
*/
// SOAP Body
SOAPBody soapBody = envelope.getBody();
SOAPElement soapBodyElem = soapBody.addChildElement("VerifyEmail", "example");
SOAPElement soapBodyElem1 = soapBodyElem.addChildElement("email", "example");
soapBodyElem1.addTextNode("mutantninja@gmail.com");
SOAPElement soapBodyElem2 = soapBodyElem.addChildElement("LicenseKey", "example");
soapBodyElem2.addTextNode("123");
MimeHeaders headers = soapMessage.getMimeHeaders();
headers.addHeader("SOAPAction", serverURI + "VerifyEmail");
soapMessage.saveChanges();
/* Print the request message */
System.out.print("Request SOAP Message = ");
soapMessage.writeTo(System.out);
System.out.println();
return soapMessage;
}
/**
* Method used to print the SOAP Response
*/
private static void printSOAPResponse(SOAPMessage soapResponse) throws Exception {
TransformerFactory transformerFactory = TransformerFactory.newInstance();
Transformer transformer = transformerFactory.newTransformer();
Source sourceContent = soapResponse.getSOAPPart().getContent();
System.out.print("nResponse SOAP Message = ");
StreamResult result = new StreamResult(System.out);
transformer.transform(sourceContent, result);
}
}
Access restriction on class due to restriction on required library rt.jar? 报错
总么都感觉是环境问题，系统bug。解决如下：
进入project properties的 Build Path 设置里.
移除 JRE System Library
再添加回来，方法是: 选择 “Add Library” ，然后选择 JRE System Library.
SSHManager类报错：com.jcraft.jsch.JSchException: UnknownHostKey
我使用的一个SSHManager类如下：
package me.leaver.Util;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;
import java.util.logging.Level;
import java.util.logging.Logger;
import com.jcraft.jsch.Channel;
import com.jcraft.jsch.ChannelExec;
import com.jcraft.jsch.JSch;
import com.jcraft.jsch.JSchException;
import com.jcraft.jsch.Session;
public class SSHManager {
private static final Logger LOGGER = Logger.getLogger(SSHManager.class
.getName());
private JSch jschSSHChannel;
private String strUserName;
private String strConnectionIP;
private int intConnectionPort;
private String strPassword;
private Session sesConnection;
private int intTimeOut;
private void doCommonConstructorActions(String userName, String password,
String connectionIP, String knownHostsFileName) {
jschSSHChannel = new JSch();
try {
jschSSHChannel.setKnownHosts(knownHostsFileName);
} catch (JSchException jschX) {
logError(jschX.getMessage());
}
strUserName = userName;
strPassword = password;
strConnectionIP = connectionIP;
}
public SSHManager(String userName, String password, String connectionIP,
String knownHostsFileName) {
doCommonConstructorActions(userName, password, connectionIP,
knownHostsFileName);
intConnectionPort = 22;
intTimeOut = 60000;
}
public SSHManager(String userName, String password, String connectionIP,
String knownHostsFileName, int connectionPort) {
doCommonConstructorActions(userName, password, connectionIP,
knownHostsFileName);
intConnectionPort = connectionPort;
intTimeOut = 60000;
}
public SSHManager(String userName, String password, String connectionIP,
String knownHostsFileName, int connectionPort,
int timeOutMilliseconds) {
doCommonConstructorActions(userName, password, connectionIP,
knownHostsFileName);
intConnectionPort = connectionPort;
intTimeOut = timeOutMilliseconds;
}
public String connect() {
String errorMessage = null;
try {
sesConnection = jschSSHChannel.getSession(strUserName,
strConnectionIP, intConnectionPort);
Properties config = new Properties();
config.put("StrictHostKeyChecking", "no");
sesConnection.setConfig(config);
sesConnection.setPassword(strPassword);
sesConnection.connect(intTimeOut);
} catch (JSchException jschX) {
errorMessage = jschX.getMessage();
}
return errorMessage;
}
private String logError(String errorMessage) {
if (errorMessage != null) {
LOGGER.log(Level.SEVERE, "{0}:{1} - {2}", new Object[] {
strConnectionIP, intConnectionPort, errorMessage });
}
return errorMessage;
}
private String logWarning(String warnMessage) {
if (warnMessage != null) {
LOGGER.log(Level.WARNING, "{0}:{1} - {2}", new Object[] {
strConnectionIP, intConnectionPort, warnMessage });
}
return warnMessage;
}
public String sendCommand(String command) {
StringBuilder outputBuffer = new StringBuilder();
try {
Channel channel = sesConnection.openChannel("exec");
((ChannelExec) channel).setCommand(command);
channel.connect();
InputStream commandOutput = channel.getInputStream();
int readByte = commandOutput.read();
while (readByte != 0xffffffff) {
outputBuffer.append((char) readByte);
readByte = commandOutput.read();
}
channel.disconnect();
} catch (IOException ioX) {
logWarning(ioX.getMessage());
return null;
} catch (JSchException jschX) {
logWarning(jschX.getMessage());
return null;
}
return outputBuffer.toString();
}
public void close() {
sesConnection.disconnect();
}
}
报这个错是因为
public String connect() {
String errorMessage = null;
try {
sesConnection = jschSSHChannel.getSession(strUserName,
strConnectionIP, intConnectionPort);
Properties config = new Properties();
config.put("StrictHostKeyChecking", "no");
sesConnection.setConfig(config);
sesConnection.setPassword(strPassword);
sesConnection.connect(intTimeOut);
} catch (JSchException jschX) {
errorMessage = jschX.getMessage();
}
return errorMessage;
}
连接这段代码里少了config.put(“StrictHostKeyChecking”, “no”);这段设置，这个是去掉了严格的安全检查，一般只用于测试目的。
navicat连接oracle数据库
之前使用PL/SQL操作Oracle数据库，使用Heidisql操作mysql数据库。。切换麻烦。而且PL/SQL搜索的时候中文有问题。于是打算使用navicat统一管理
方法是：
1.首先下载Instant Client 的32位版本和Navicat Premium
2.然后解压Instant Client，配置navicat
选择oci文件即可
然后新建oracle配置，选择basic模式，其他的根据你的数据库信息自己填写即可。