一些代码小技巧或规范

List<String> imgServerUrls = new ArrayList<String>();

String  str = StringUtils.join(imgServerUrls, ",")

 

 

1、In使用

fileCodes = "'"+fileCodes.replace(",", "','")+"'";
StringBuffer hqlBuf = new StringBuffer("from EipResourceFile t where 1=1 and t.enabledFlag ='Y' and t.fileCode in ("+fileCodes+")");

//添加附件
	 String hqlStr = "from EipQuestionFile t where t.questionOperateId = "+eipQuestionOperateV.getId()+" and t.enabledFlag='Y'";
 List<EipQuestionFile> eipList = eipQuestionFileDAO.find(hqlStr);    			 
	 if(eipList != null && eipList.size() > 0){
		String fileCodes  = "";
		for (EipQuestionFile eipQuestionFile : eipList) {
				if (eipQuestionFile == null) continue;
				fileCodes = fileCodes + eipQuestionFile.getFileCode()+",";
			}
		if(StringUtils.isEmpty(fileCodes)){
			return null;
		}
		fileCodes = fileCodes.substring(0,fileCodes.length()-1);
		fileCodes = "'"+fileCodes.replace(",", "','")+"'";
		StringBuffer hqlBuf = new StringBuffer("from EipResourceFile t where 1=1 and t.enabledFlag ='Y' and t.fileCode in ("+fileCodes+")");
		
		List<EipResourceFile> eipResourceFileList = dao.find(hqlBuf.toString());
		if(eipResourceFileList != null && eipResourceFileList.size() > 0){
			eipQuestionOperateV.setEipResourceFileList(eipResourceFileList);
		}    		              
	}  

 或：

private String buildQuerySql(String[] addResp){
	StringBuffer sql = new StringBuffer();
	sql.append("(");
	sql.append("'"+addResp[0]+"'");
	for(int i=1;i<addResp.length;i++){
		sql.append(",");
		sql.append("'"+addResp[i]+"'");
	}
	sql.append(")");
	return sql.toString();
}

//或
if(srvId.size() > 0){
	StringBuffer hql = new StringBuffer();
	hql.append("from EsbWsdlFileV where serviceId in (");
	hql.append(srvId.get(0));
	for(int i = 1; i < srvId.size(); i ++){
		hql.append(", ").append(srvId.get(i));
	}
	hql.append(") order by serviceId");
	return wsdlFileVDao.findByHql(hql.toString());
}

2.string.format

long timestamp = System.currentTimeMillis();
String.format("%1$tY%1$tm%1$td%1$tH%1$tM%1$tS", timestamp)
String.format("package %s.proxy;\n", pkg)

"select t.%s, t.%s from %s t where (t.%s like :value1 ||'%%' or lower(F_TRANS_PINYIN_CAPITAL(t.%s)) like :value2 ||'%%' or t.%s like :value3 ||'%%' )";

String.format(sql, arg.getCodeField(), arg.getNameField(), arg.getTablename(), arg.getCodeField(),
            arg.getNameField(),arg.getNameField());

 

 3、根据模版创建文件

org.apache.commons.io.FileUtils
org.apache.commons.io.IOUtils

模版：

handler-chain.comm.template（SOAPHandler过滤器文件）：

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<javaee:handler-chains 
     xmlns:javaee="http://java.sun.com/xml/ns/javaee" 
     xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <javaee:handler-chain>
    <javaee:handler>
      <javaee:handler-class>com.soa.ws.interceptor.InstanceHandler2</javaee:handler-class>
    </javaee:handler>
  </javaee:handler-chain>
</javaee:handler-chains>

 创建：

/**
	 * 创建handler-chain.xml
	 * 
	 * @param path handler-chain.xml的绝对路径
	 * @param project
	 * 
	 * @return 是否创建成功
	 */
	private boolean writeHandlerChain(String path, WebServiceProject project) {
		
		String handlerChain = null;
		try {
			handlerChain = IOUtils.toString(this.getClass().getClassLoader().getResourceAsStream("META-INF/ws/handler-chain.comm.template"));
			
			logger.debug("get template pass...");
			
			handlerChain = String.format(handlerChain, project.getName());
			
			logger.debug("template format :\n" + handlerChain);
			
			FileUtils.writeStringToFile(new File(path), handlerChain, "UTF-8");
			
			logger.debug("write " + path + " to harddrive pass...");
		} catch (Exception e) {
			e.printStackTrace();
			logger.error("writeBuild error : " + e.getMessage());
			return false;
		}
		return true;
	}

 

填充后创建文件：

模版文件：

ejb-jar.comm.template

 

<?xml version="1.0" encoding="UTF-8"?>
<ejb-jar xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
		xmlns="http://java.sun.com/xml/ns/javaee" xmlns:ejb="http://java.sun.com/xml/ns/javaee/ejb-jar_3_0.xsd"
		xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/ejb-jar_3_0.xsd"
		version="3.0">
	<display-name>%1$s</display-name>
</ejb-jar>

 

 

参数可依次叠加，如%2%s ,  %3%s ...

创建：

 

/**
	 * 创建src/META-INF/ejb-jar.xml
	 * 
	 * @param path ejb-jar.xml的的绝对路径
	 * @param project
	 * 
	 * @return 是否创建成功
	 */
	protected boolean writeEJBJar(String path, WebServiceProject project){
		String ejbJar = null;
		try {
			ejbJar = IOUtils.toString(this.getClass().getClassLoader().getResourceAsStream("META-INF/ws/ejb-jar.comm.template"));
			
			logger.debug("get template pass...");
			
			ejbJar = String.format(ejbJar, project.getName());
			
			logger.debug("template format :\n" + ejbJar);
			
			FileUtils.writeStringToFile(new File(path), ejbJar, "UTF-8");
			
			logger.debug("write " + path + " to harddrive pass...");
		} catch (Exception e) {
			e.printStackTrace();
			logger.error("writeBuild error : " + e.getMessage());
			return false;
		}
		return true;
	}

 。。。