1.请求服务器的接口：其中涉及到http请求，url。
依赖org.apache.httpcomponents/httpclient/4.3.4
//1. 创建默认的httpClient实例.
CloseableHttpClient httpclient =null;
httpclient = HttpClients.createDefault();
//2. 创建httppost
HttpPost httpPost =newHttpPost(url1);
httpPost.addHeader(HTTP.CONTENT_TYPE,"application/x-www-form-urlencoded");
// 3. 参数
String exp_id="0^0^0^0^0^0^0^0";
String utf16_gpoint="12950074.7,4836976.15";
List postBody =newArrayList();
postBody.add(newBasicNameValuePair("queryString",query));
postBody.add(newBasicNameValuePair("forceQuery","1"));
postBody.add(newBasicNameValuePair("exp_id","0^0^0^0^0^0^0^0"));
postBody.add(newBasicNameValuePair("gpoint","12950074.7,4836976.15"));
StringBuilder postData =newStringBuilder();
for(BasicNameValuePair namevalue : postBody) {
postData.append(namevalue.getName()).append("=")
.append(StringHelper.urlEncodeUtf16le(namevalue.getValue())).append("&");
}
postData.deleteCharAt(postData.length() -1);
StringEntity se =newStringEntity(postData.toString());
se.setContentEncoding("UTF-16LE");
se.setContentType("application/json");
httpPost.setEntity(se);
response = httpclient.execute(httpPost);
//解析返结果
HttpEntity entity = response.getEntity();
2. hadoop java map-reduce
依赖org.apache.hadoop hadoop-core 0.20.2
程序输入处，int status = ToolRunner.run(new Main(),args);
构建Main类，extends Configured implements Tool 。在Main类中，重写run方法。在run方法中，定义Configuration conf = getConf()； 并进行配置。定义Jobjob =newJob(conf);可配置输入输出路径，配置mapreduce等各种。在Main类中实现public static class InputMapper extends Mapper，public static class OutputReducer extends Reducer
3. xml 处理
StringReader reader =newStringReader(resStr);
InputSource source =newInputSource(reader);
SAXReader sr =newSAXReader();
Document doc = sr.read(source);
Element root = doc.getRootElement();
//遍历根节点下的子节点（同样也可以遍历某个含子节点的子节点）
for(Object obj : root.elements()) {
Element ele = (Element) obj;
//获取子节点的属性
if(ele.getName() =="process_node"){
for(Object ob:ele.elements()){
4. json串生成
JSONObject jsonObject =newJSONObject();
jsonObject.put("weight",((Element) xx).attribute("weight").getValue());
String jsonStr == jsonObject.toString();
5. maven 打包的配置
http://www.jianshu.com/p/7a0e20b30401
https://maven.apache.org/plugins/maven-shade-plugin/
include/exclude 掉
<include>junit/framework/**</include> <exclude>org/junit/experimental/**</exclude>
通过设置 MainClass 创建一个可执行 Jar 包
包括把依赖打一个jar包、依赖jar包的冲突解决 relocation
6. 多线程
