解析XML文件(二)----使用dom4j方式（一）

针对之前写过的一种解析XML文件的方式
解析XML文件(一)----使用XStream方式 . 现在尝试用第二种常用的方式进行解析XML文件，便于对比学习！

顺便分享下网友总结的这个篇文章 dom4j解析xml
分别介绍了读、写、修改三个例子！

首先需要下载对应的jar包，我们系统用的是dom4j-1.6.jar（已上次我的资源，供下载分享）。

对于上一篇文章中的 查询成功后返回的XML文件格式：



现在做如下处理:

/**
* 将查询结果List生成xml并用GZip压缩
*
*/
private void setZipResults(List list,
QueryRequest request,
QueryResponse response) {
//1.创建Document对象
Document document = DocumentHelper.createDocument();
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
double grossPremium=0.0;
// 生成xml
if(list!=null){
Element root = document.addElement("rlt"); //2.创建根节点
root.addElement("st").addText("1");//3.创建子节点st,并设置内容
Element InsuranceList=root.addElement("InsuranceList");
InsuranceList.addElement("Count").addText(list.size()+"");
for(int i=0;i<list.size();i++){
TPublicPolicy policy = (TPublicPolicy)list.get(i);
grossPremium=grossPremium+policy.getGrossPremium();
}
InsuranceList.addElement("TotalPremium").addText(grossPremium+"");
Element Details=InsuranceList.addElement("Details");
Iterator it = list.iterator();
while (it.hasNext()) {//4.循环生成重复节点
TPublicPolicy policy = (TPublicPolicy) it.next();
String tcSerialNo=policy.getOuterOrderId();
String updated=sdf.format(policy.getApplyDate());
String applicantName=policy.getRfInsname();
String policyNum=policy.getPolicyNo();
String status=policy.getStatus()+"";
String	planCode=policy.getClassesCode();
String premium=policy.getGrossPremium().toString();
Element Insurance = Details.addElement("Insurance"); //循环子节点6

if (!StringUtil.isNull(tcSerialNo)) {
Insurance.addElement("tcSerialNo").addText(tcSerialNo);
} else {
Insurance.addElement("tcSerialNo");
}
if (!StringUtil.isNull(updated)) {
Insurance.addElement("updated").addText(updated);
} else {
Insurance.addElement("updated");
}
if (!StringUtil.isNull(applicantName)) {
Insurance.addElement("applicantName").addText(applicantName);
} else {
Insurance.addElement("applicantName");
}
if (!StringUtil.isNull(policyNum)) {
Insurance.addElement("policyNum").addText(policyNum);
} else {
Insurance.addElement("policyNum");
}
if (!StringUtil.isNull(status)) {
Insurance.addElement("status").addText(status);
} else {
Insurance.addElement("status");
}
if (!StringUtil.isNull(planCode)) {
Insurance.addElement("planCode").addText(planCode);
} else {
Insurance.addElement("planCode");
}
if (!StringUtil.isNull(status)) {
Insurance.addElement("premium").addText(premium);
} else {
Insurance.addElement("premium");
}
}
}
//创建XML文件并用GZip压缩
String fileName =String.valueOf(DateUtil.getSysDateLong()) + ".xml";
String zipFileName=String.valueOf(DateUtil.getSysDateLong()) + ".xml.zip";
OutputFormat format = OutputFormat.createPrettyPrint();
format.setEncoding("utf-8");//处理中文乱码问题
XMLWriter writer = null;
GZIPOutputStream zipout = null;
FileInputStream zipin = null;
BufferedInputStream in = null;
ByteArrayOutputStream out = null;
try {
// a.写xml文件
File file = new File(fileName);
writer = new XMLWriter(new BufferedWriter(new FileWriter(file)),format);
writer.write(document);
writer.flush();
// b.用GZip压缩文件
zipin = new FileInputStream(fileName);
File zip = new File(zipFileName);
zipout = new GZIPOutputStream(new FileOutputStream(zip));
byte[] buffer = new byte[4096];
int bytes_read;
while ((bytes_read = zipin.read(buffer)) != -1) {
zipout.write(buffer, 0, bytes_read);
}
zipout.flush();
zipout.finish();
//c.读ZIP到BYTE[]
in = new BufferedInputStream(new FileInputStream(zipFileName));
out = new ByteArrayOutputStream(4096);

buffer = new byte[4096];
bytes_read = 0;
while ((bytes_read = in.read(buffer)) != -1) {
out.write(buffer, 0, bytes_read);
}
out.flush();
response.setSysMessage(new SysMessage(SoapCodeConstant.TC_102,"xxx查询接口","XML文件处理成功"));
response.setInsuranceDetailZip(out.toByteArray()); //byte[]
} catch (Exception e) {
// TODO Auto-generated catch block
response.setSysMessage(new SysMessage(
SoapCodeConstant.TC_100, "服务器内部处理请求异常","XML文件处理失败"));
log.error("xxx请求结果处理XML文件时失败", e);
} finally {
try {
if(writer!=null)writer.close();
if(zipin!=null)zipin.close();
if(zipout!=null)zipout.close();
if(in!=null)in.close();
if(out!=null)out.close();
new File(fileName).delete();
new File(zipFileName).delete();

} catch (Exception e) {
response.setSysMessage(new SysMessage(
SoapCodeConstant.TC_100, "服务器内部处理请求异常","XML文件处理失败"));
log.error("请求结果处理XML文件时失败", e);
log.error("", e);
}
}
}