Java 使用 httpClient 发送get、post请求

太过爱你忘了你带给我的痛 2021-09-18 05:14 600阅读 0赞

#### maven 依赖 ####

<dependency>
        <groupId>org.apache.httpcomponents</groupId>
        <artifactId>httpclient</artifactId>
        <version>4.5.6</version>
    </dependency>

#### get 请求 ####

**带参数的 get 请求**

public static void getXijingTemplate() throws Exception {
        String url = "http://www.example.com";
        URIBuilder builder = new URIBuilder(url);
        builder.addParameter("username", "username");
        builder.addParameter("password", "123456");
        URI uri = builder.build();
        HttpGet httpGet = new HttpGet(uri);
        CloseableHttpResponse response = (CloseableHttpResponse) client.execute(httpGet);
        System.out.println(decodeUnicode(EntityUtils.toString(response.getEntity(), Consts.UTF_8)));
    }

#### post 请求 ####

**带参数的 post 请求**

public static void executeGet() throws IOException {
        String url = "http://www.example.com";
        JSONObject param = JSONObject.parseObject(params);
        StringEntity entity = new StringEntity(param.toJSONString(), Charset.forName("UTF-8"));
        HttpPost post = new HttpPost(url);
        // 构造消息头
        post.setHeader("Content-type", "application/json; charset=utf-8");
        entity.setContentEncoding("UTF-8");
        // 发送Json格式的数据请求
        entity.setContentType("application/json");
        post.setEntity(entity);
    
        HttpResponse response = client.execute(post);
        System.out.println(decodeUnicode(EntityUtils.toString(response.getEntity(), Consts.UTF_8)));
    }

**有的请求返回的结果字符是 unicode 类型的，对于中文，不便于排查问题，可以使用以下的方法处理返回的结果**：

//Unicode转中文
    public static String decodeUnicode(final String unicode) {
        StringBuffer string = new StringBuffer();
    
        String[] hex = unicode.split("\\\\u");
    
        for (int i = 0; i < hex.length; i++) {
    
            try {
                // 汉字范围 \u4e00-\u9fa5 (中文)
                if(hex[i].length()>=4){//取前四个，判断是否是汉字
                    String chinese = hex[i].substring(0, 4);
                    try {
                        int chr = Integer.parseInt(chinese, 16);
                        boolean isChinese = isChinese((char) chr);
                        //转化成功，判断是否在  汉字范围内
                        if (isChinese){//在汉字范围内
                            // 追加成string
                            string.append((char) chr);
                            //并且追加  后面的字符
                            String behindString = hex[i].substring(4);
                            string.append(behindString);
                        }else {
                            string.append(hex[i]);
                        }
                    } catch (NumberFormatException e1) {
                        string.append(hex[i]);
                    }
    
                }else{
                    string.append(hex[i]);
                }
            } catch (NumberFormatException e) {
                string.append(hex[i]);
            }
        }
    
        return string.toString();
    }
    
    
    /**
     * 判断是否为中文字符
     *
     * @param c
     * @return
     */
    public static boolean isChinese(char c) {
        Character.UnicodeBlock ub = Character.UnicodeBlock.of(c);
        if (ub == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS
                || ub == Character.UnicodeBlock.CJK_COMPATIBILITY_IDEOGRAPHS
                || ub == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS_EXTENSION_A
                || ub == Character.UnicodeBlock.GENERAL_PUNCTUATION
                || ub == Character.UnicodeBlock.CJK_SYMBOLS_AND_PUNCTUATION
                || ub == Character.UnicodeBlock.HALFWIDTH_AND_FULLWIDTH_FORMS) {
            return true;
        }
        return false;
    }