[笔记]写代码遇到的一些问题汇总下

本篇是用来填上一篇挖下的坑的。

1.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>[email protected]</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("[email protected]");
        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);
    }

}

2.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.

3.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。

4.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。

5.HttpClient的logger日志实在太多了

大人，实在太多了。看不过来啊。附赠一篇log4j配置文件详解

在log4j.properties文件中添加如下配置信息

log4j.logger.httpclient.wire.header=INFO

log4j.logger.httpclient.wire.content=INFO

log4j.logger.org.apache.commons.httpclient = INFO

_**6.其他**_

最后附赠一些实用的工具

http://www.freeformatter.com/ 程序员必备。各类转换，包括转义工具，格式校验工具。效果很好。

流体力学理论与F1赛车的空气动力学1，2，3 什么雷诺数，伯努利方程，文丘里效应，当年木有好好学啊。这么高大上的东西果然还是有压力。