一次升级jar包遇到的空指针异常

       今天自己在升级公司的一个jar后，一直报空指针异常。代码如下

      

package com.zhuanche.http;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.google.common.collect.Maps;
import org.apache.commons.lang3.StringUtils;
import org.apache.http.*;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.ContentType;
import org.apache.http.entity.StringEntity;
import org.apache.http.entity.mime.HttpMultipartMode;
import org.apache.http.entity.mime.MultipartEntityBuilder;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.slf4j.MDC;

import java.io.File;
import java.io.InputStream;
import java.nio.charset.Charset;
import java.util.*;

import static com.sq.common.okhttp.constants.OkHttpConfig.DEFAULT_HEADER_ACCEPT_ENCODING;
import static com.sq.common.okhttp.constants.OkHttpConfig.DEFAULT_HEADER_ACCEPT_ENCODING_VALUE;
import static com.sq.common.okhttp.constants.OkHttpConfig.DEFAULT_HEADER_REQLOGIGNORE;


/**
 * 处理post请求
 * @author huiwu
 */
public final class PostRequest extends Request{

    private static final Logger logger = LoggerFactory.getLogger(PostRequest.class);

    private HttpPost post = null;

    private HttpClient client = null;
    
    private HttpEntity httpEntity = null;

    private final static String TRACEKEY = "X-Request-Id";

    private final static String TRACEID = "traceId";

    private static final String CHARNULL = "";

    private final List<NameValuePair> params = new ArrayList<NameValuePair>();

    private static final String DEFAULTCHARSET = "UTF-8";

    private String charset = DEFAULTCHARSET;

    public PostRequest(HttpClient client, String url) {
        this.client = client;
        this.addHeaders(null);

        post = new HttpPost(url);
    }

    public PostRequest(HttpClient httpClient, String url,
            String charset) {
        this(httpClient,url);
        this.charset = charset;
        this.addHeaders(null);
    }

    public PostRequest addHeader(String name, Object value) {
        if (value == null) {
            return this;
        }
        if(StringUtils.isNotEmpty(name)){
            post.addHeader(name, String.valueOf(value));
        }
        return this;
    }

    public PostRequest addHeaders(Map<String,Object> headers){
        //nginx统一是TRACE_KEY，项目里面有些是traceId 所以做的兼容
        logger.info("tracekey:" + TRACEKEY + ",value:" + MDC.get(TRACEKEY));
        addHeader(DEFAULT_HEADER_REQLOGIGNORE, String.valueOf(false));
        addHeader(DEFAULT_HEADER_ACCEPT_ENCODING, DEFAULT_HEADER_ACCEPT_ENCODING_VALUE);
        if(MDC.get(TRACEKEY) != null){
            addHeader(TRACEKEY,MDC.get(TRACEKEY));
        }else if(MDC.get(TRACEID) != null){
            addHeader(TRACEKEY,MDC.get(TRACEID));
        }else {
            addHeader(TRACEKEY,CHARNULL);
        }

        if (headers==null||headers.isEmpty()) {
            return this;
        }
        Set<String> keySets = headers.keySet();
        Iterator<String> it = keySets.iterator();
        while (it.hasNext()){
            String key = it.next();
            addHeader(key, headers.get(key));
        }
        return this;
    }

    public PostRequest addParam(String name, Object value) {
        if (value == null) {
            return this;
        }
        params.add(new BasicNameValuePair(name, String.valueOf(value)));
        return this;
    }
    public PostRequest addParams(Map<String,Object> map) {
        if (map == null||map.isEmpty()) {
            return this;
        }
        Set<String> keys = map.keySet();
        Iterator<String> it = keys.iterator();
        while (it.hasNext()){
            String paramName = it.next();
            addParam(paramName,map.get(paramName));
        }
        return this;
    }
    
    /**
     * 设置body后，通过addParam方法添加的参数将不会设置到请求中
     * @param body
     * @return
     */
    public PostRequest setBody(String body) {
        return setBody(body,ContentType.TEXT_PLAIN);
    }

    /**
     * 设置body后，通过addParam方法添加的参数将不会设置到请求中
     * @param body
     * @return
     */
    public PostRequest setBody(String body,ContentType contentType) {
        try {
            if (body==null) {
                return this;
            }
            httpEntity = new StringEntity(body,charset);
        } catch (Exception e) {
            logger.error("set String body error ", e);
        }
        return this;
    }

    public PostRequest setLimitResult(int limitResult) {
        this.limitResult = limitResult;
        return this;
    }
    
    
    /**
     * 添加文件参数,一个POST请求添加一个文件参数
     * @param name 上传文件的参数名
     * @param file
     * @return
     */
    public Request addFile(String name, File file) {
        try {
            addFile(name, file, ContentType.DEFAULT_BINARY);
        } catch (Exception e) {
            logger.error("set File body error ", e);
        }
        return this;
    }
    
    /**
     * 添加文件参数,一个POST请求添加一个文件参数
     * @param name 上传文件的参数名
     * @param file
     * @param contentType 默认为 application/octet-stream
     * @return
     */
    public Request addFile(String name, File file,ContentType contentType) {
        try {
            if (contentType==null) {
                contentType = ContentType.DEFAULT_BINARY;
            }
            MultipartEntityBuilder builder = MultipartEntityBuilder.create();
            builder.setMode(HttpMultipartMode.BROWSER_COMPATIBLE);
            builder.addBinaryBody(name, file, contentType,file != null ? file.getName() : null);
            builder.setCharset(Charset.forName(charset));
            if (params!=null&&!params.isEmpty()) {
                for (NameValuePair nv : params) {
                    builder.addTextBody(nv.getName(),nv.getValue());
                }
            }
            httpEntity = builder.build();
        } catch (Exception e) {
            logger.error("set File error ", e);
        }
        return this;
    }
    

    public String execute()throws HttpException {
        return exc(String.class);
    }

    @Override
    public JSONObject executeToJson()throws HttpException {
        return exc(JSONObject.class);
    }

    public  <T>T executeToObject(Class<T> clazz)throws HttpException{
        return exc(clazz);
    }

    public PostRequest setIgnoreResult(boolean ignoreResult) {
         this.ignoreResult = ignoreResult;
        return this;
    }

    @SuppressWarnings("unchecked")
    private <T> T exc(Class<T> clazz) throws HttpException {
        T obj = null;
        int status = 0;
        String result = null;
        Integer inputSize = 0;
        String lbrqid = "";
        String x_ca_requestid = "";
        long startTime = System.currentTimeMillis();
        try {
            if (httpEntity==null) {
                httpEntity = new UrlEncodedFormEntity(params,charset);
            }
            post.setEntity(httpEntity);
            post.setConfig(getRequestConfig());
            HttpResponse response = client.execute(post);
            HttpEntity entity = response.getEntity();
            try {
                // traceid唯一ID
                Header[] headers = response.getHeaders("lbrqid");
                if (null != headers && headers.length > 0) {
                    lbrqid = headers[0].getValue();
                }

                // 阿里接口响应ID
                Header[] headers2 = response.getHeaders("X-Ca-Request-Id");
                if (null != headers2 && headers2.length > 0) {
                    x_ca_requestid = headers2[0].getValue();
                }
                if(StringUtils.isEmpty(lbrqid)){
                    lbrqid = x_ca_requestid;
                }
                // 获取字节大小
                InputStream content = entity.getContent();
                inputSize = content.available();
            } catch (Exception e) {
                logger.error("获取头信息异常.", e);
            }
            status = response.getStatusLine().getStatusCode();
            if (entity!=null) {
                try {
                    ContentType ct = ContentType.get(entity);
                    result = EntityUtils.toString(entity, charset);
                    if (clazz==null||clazz == String.class){
                        if (StringUtils.isNotBlank(result)){
                            obj =  (T) result;
                        }
                    }else if (ContentType.APPLICATION_JSON.getMimeType().equals(ct.getMimeType())){
                        if (clazz == JSONObject.class){
                            if (StringUtils.isNotBlank(result)){
                                obj = (T) JSON.parseObject(result);
                            }
                        }else{
                            if (StringUtils.isNotBlank(result)){
                                obj = (T) JSON.parseObject(result, clazz);
                            }
                        }
                    }else{
                        throw new RuntimeException("Not support contentType "+ ct.toString());
                    }
                }finally{
                    EntityUtils.consume(entity);
                }
            }
            } catch (Exception e) {
            long endTime = System.currentTimeMillis();
                logger.warn("{}|{}|{}|{}|1|{}", post.getURI(), status, (endTime-startTime), inputSize, lbrqid);
            throw new HttpException("",e);
        }finally {
            long endTime = System.currentTimeMillis();
            if (ignoreResult){
                logger.info("cost={}ms,status={},url={},params={}", endTime - startTime,status, post.getURI(),params);
            }else{
                if(limitResult <= 0 || StringUtils.defaultString(result, "").length() <= limitResult){
                    logger.info("cost={}ms,status={},url={},params={},result={},x_ca_requestid={}", endTime - startTime,status,
                            post.getURI(),params,result,x_ca_requestid);
                }else{
                    result = result.substring(0, limitResult);
                    logger.info("cost={}ms,status={},url={},params={},result={},x_ca_requestid={}", endTime - startTime,status,
                            post.getURI(),params,result,x_ca_requestid);
                }
            }
            logger.warn("{}|{}|{}|{}|0|{}", post.getURI(), status, (endTime-startTime), inputSize,lbrqid);
        }
        return obj;
    }

    public PostRequest setReadTimeOut(int readTimeOut){
        if (readTimeOut>0) {
            this.readTimeOut = readTimeOut;
        }
        return this;
    }
    
    public PostRequest setConnectTimeOut(int connectTimeOut){
        if (connectTimeOut>0) {
            this.connectTimeOut = connectTimeOut;
        }
        return this;
    }
    
    public PostRequest setWaitTimeOut(int waitTimeOut){
        if (waitTimeOut>0) {
            this.waitTimeOut = waitTimeOut;
        }
        return this;
    }

}

    红色部分代码一直空指针，然而自己都日志都打印出来了，入参不是空的啊。。。

    想了半天，在本地调试，最后发现，是post 为空了。。 自己代码还没有new 就直接去使用了。

    空指针，要么是参数问题，要么是方法里面有其他调用的参数为空。。 一下午的时间，解决了一个小问题，感觉好浪费时间。

      之后打包 ：mvn deploy -e  可以了。