java中 org.apache.http.impl.client.HttpClientBuilder 通过tddl存数据库中文乱码问题

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本文介绍了解决通过Apache HTTP客户端发送POST请求至Elasticsearch和Redis时出现的中文乱码问题。在发送JSON数据前，通过设定StringEntity的编码为UTF-8，确保了中文字符的正确传输。

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问题描述：数据通过tddl（tddl：数据库中间件，通过http请求方式，把数据间距存入数据库）存入redis和http请求方式存入es，用到了apache发送请求的jar包，存数据之前，debug模式下，中文没有乱码，是正常编码，存入redis、es后，发现中文乱码，是一串问号。
解决办法：创建请求时，指定StringEntity编码集
代码示例如下：

import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.ContentType;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.util.EntityUtils;

@Component
public class RequestTools {
    private  Logger logger = LoggerFactory.getLogger(RequestTools.class);
    private  String userAgent =  "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/29.0.1547.66 Safari/537.36";
    private  final String DEF_CHATSET = "UTF-8";
    private  final int DEF_CONN_TIMEOUT = 30000;
    private  final int DEF_READ_TIMEOUT = 30000;

    /**
     * 请求es插入数据操作，参数为字符串,post请求
     * @param url
     * @param str json格式的字符串
     * @return 成功：{"_index":"geofencing","_type":"weblocation","_id":"AWhwcUT7RCuwyAS_S4C4",
     * "_version":1,"result":"created","_shards":{"total":1,"successful":1,"failed":0},"created":true}
     */
    public  JSONObject netEsRequestSave(String url,String str){
        CloseableHttpClient httpclient = HttpClientBuilder.create().build();
        HttpPost post = new HttpPost(url);
        post.addHeader("Authorization",getToken());
        JSONObject response = null;
        try {
            String mimeType = "application/json";
             //处理中文乱码问题
            ContentType contentType = ContentType.create(mimeType,"UTF-8");
            StringEntity s = new StringEntity(str,contentType);
            s.setContentEncoding("UTF-8");
            
            //发送json数据需要设置contentType
            s.setContentType("application/json");
            post.setEntity(s);
            HttpResponse res = httpclient.execute(post);
            logger.info("res code:",res.getStatusLine().getStatusCode());
            if(res.getStatusLine().getStatusCode() == HttpStatus.SC_CREATED){
                String result = EntityUtils.toString(res.getEntity());// 返回json格式：
                response = JSONObject.fromObject(result);
                logger.info("es插入数据返回结果：",response);
            }
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
        return response;
    }

 
}