JDK8新写法

去重：

list.stream.distinct().collect(Collectors.toList());

list转map，value值是属于的参数，输入的是什么就是什么

Map<Integer,PolicyBasePo> map = list.stream().collect(Collectors.toMap(PolicyBasePo::getId,Function.identity()));

map里去重,如果map中o1和o2的key相同，则保留o1

list.stream().filter(tblPolicy->deviceIdList.contains(Long.valueOf(tblPolicy.getDeviceId()))).collect(Collcetors.toMap(TblPolicy::getId,Function.identity(),(o1,o2)->o1));

java 调用Linux环境运行Linuxshell脚本

String[] info = exect（String script，String cmdDir） info[0]为ip地址？

script = "./scripts/get_cluster.sh"

cmdDir = /usr/opt/xg

Process process = null;

try{

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

process = Runtime.getRuntime().exec(script,new String[]{},new File(cmdDir));

BufferedReader input = new BufferedReader(new InputStreamReader(process.getInputStreadm()));

String line = null;

while((line = input.readline())!= null){

        result.add(line);

}

input.close();

if(result.size()>0){

        return result.toArray(new String[result.size()]);

}

int exitval = process.waitFor();

log.info("",new Object[]{exitVal})；

return new String[]{};  废代码

}catch(Exception e){

}

返回两个值：

ImmutablePair<String,String> 

return ImmutablePair.of(privateKey,publicKey);