//创建缺陷时所需要的字段，以及设置默认值
 public static String getBugCreateMeta(String jiraProjectId) {
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        //api 接口
        String url = "http://you jira address:port/rest/api/2/issue/createmeta?projectIds=" + jiraProjectId + "&expand=projects.issuetypes.fields";
        //初始值
        String issueField = "{\n  \"fields\": {\n    \"project\": {\n      \"id\": \"" + jiraProjectId + "\"\n    }";
        //除了必填项外 需要的字段
        String[] otherRequiredField = {"assignee"};
        //接口调用
        HttpClientResponse httpClientResponse = httpClient(1, url, "");
        JSONObject jsonObject = JSONObject.fromObject(httpClientResponse.getResponseBody().toString());
        //接口返回结果示例参考下图
        //获取项目信息
        JSONArray projects = jsonObject.getJSONArray("projects");
        JSONObject project = JSONObject.fromObject(projects.get(0));
        //获取所有issue类型
        JSONArray issuetypes = project.getJSONArray("issuetypes");
        //查找缺陷类型
        int bugIssueIndex = 0;//用于保存缺陷类型坐标
        for (int i = 0; i < issuetypes.size(); i++) {
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            JSONObject issuetype = JSONObject.fromObject(issuetypes.get(i));
            if ("缺陷".equals(issuetype.getString("name"))) {
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                bugIssueIndex = i;
                //添加类型字段
                issueField += replace(jiraFieldOptionTemplate, "issuetype", issuetype);
                break;
            }
        }
        //获取缺陷类型所有信息
        JSONObject issuetype = JSONObject.fromObject(issuetypes.get(bugIssueIndex));
        //获取提交缺陷时所有字段
        JSONObject fields = issuetype.getJSONObject("fields");
        //循环所有字段，并获取默认值
        Iterator<String> iterator = fields.keys();
        while (iterator.hasNext()) {
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            String key = iterator.next();
            //获取字段信息
            JSONObject field = fields.getJSONObject(key);
            //字段是必填且没有设置默认值，则选择默认值
            if (ArrayUtils.contains(otherRequiredField, key) ||
                    (field.getBoolean("required") && !field.getBoolean("hasDefaultValue"))) {
                //获取字段类型
                JSONObject schema = field.getJSONObject("schema");
                if (field.containsKey("allowedValues")) {
                    //如果字段值有可选项，则默认取值第一个
                    JSONArray allowedValues = field.getJSONArray("allowedValues");
                    JSONObject allowedValue = JSONObject.fromObject(allowedValues.get(0));
                    issueField = getIssueField(schema, issueField, key, allowedValue);
                } else {
                    //字段值默认key
                    issueField = getIssueField(schema, issueField, key, null);
                }
            }
        }
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        //闭环json
        issueField = issueField + "\n  }\n}";
        return issueField;
    }
    
    /**
     * 设置那些类型的字段
     *
     * @param schema
     * @param issueField
     * @param key
     * @param allowedValue
     * @return
     */
    private static String getIssueField(JSONObject schema, String issueField, String key, JSONObject allowedValue) {
        //针对字段不同类型，定制不同模板
         String jiraFieldArrayTemplate = ",\n    \"key\": [\n      {\n        \"id\": \"jira_id\"\n      }\n    ]";
         String jiraFieldOptionTemplate = ",\n    \"key\": {\n      \"id\": \"jira_id\"\n    }";
         String jiraFieldStringTemplate = ",\n    \"key\": \"jira_key\"";
         String jiraFieldUserTemplate = ",\n    \"key\": {\n      \"name\": \"jira_key\"\n    }";
        //字段类型，需要可以扩展
        switch (schema.getString("type")) {
            case "array":
                issueField += replace(jiraFieldArrayTemplate, key, allowedValue);
                break;
            case "option":
                issueField += replace(jiraFieldOptionTemplate, key, allowedValue);
                break;
            case "string":
                issueField += replace(jiraFieldStringTemplate, key, null);
                break;
            case "user":
                issueField += replace(jiraFieldUserTemplate, key, null);
                break;
            default:
                break;
        }
        return issueField;
    }
    
     /**
     * 替换值
     *
     * @param template
     * @param key
     * @param allowedValue
     * @return
     */
    private static String replace(String template, String key, JSONObject allowedValue) {
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        //默认值是key，如果有可选值则获取可选值
        String value = key;
        if (allowedValue != null) {
            value = allowedValue.getString("id");
        }
        //以这种方式根据key的不同定制值
        if (key.equals("customfield_10001")) {
            value = "10001";
        }
        return StringUtils.replaceEach(template, new String[]{"key", "jira_id"}, new String[]{key, value});
    }
//url 可使用参数projectIds表示项目id、projectKeys表示项目key、issuetypeIds表示类型Id、issuetypeNames表示类型名称、expand增加展示的字段
//http://jyou jira address:port/rest/api/2/issue/createmeta?projectIds=100001&expand=projects.issuetypes.fields&issuetypeIds=10001