创建HttpClient对象 CloseableHttpClient httpClient = HttpClientscreateDefault; 创建URIBuilder URIBuilder uriBuilder = new URIBuilderSystem_UrlgetOssDomain+pushpushMessagehtml; 设置参数 uriBuilders

在创建HttpGet对象之前，需要对URIBuilder对象设置字符编码为UTF-8。修改代码如下：

//创建URIBuilder
URIBuilder uriBuilder = new URIBuilder(System_Url.getOssDomain()+"/push/pushMessage.html");
//设置字符编码为UTF-8
uriBuilder.setCharset(Charset.forName("UTF-8"));
//设置参数
uriBuilder.setParameter("pushFrequency","update");
uriBuilder.setParameter("categoryId",management.getId().toString());
uriBuilder.setParameter("categoryName",management.getName());
uriBuilder.setParameter("articleTitle",sysLaws.getLawsName());
//创建HttpGet对象，设置url访问地址
HttpGet httpGet = new HttpGet(uriBuilder.build());

通过调用setCharset(Charset.forName("UTF-8"))方法，将字符编码设置为UTF-8。这样在构建URI时，参数会以UTF-8格式进行编码传递