jackson實現java對象轉支付寶/微信模板消息

一、支付寶消息模板大致長這樣

{"to_user_id": "","telephone": "xxxxx","template": {"template_id": "xxxxxx","context": {"head_color": "#85be53","url": "www.baidu.com","action_name": "查看詳情","keyword1": {"color": "#85be53","value": "15700000000"},"keyword2": {"color": "#85be53","value": "2017年06月"},"keyword3": {"color": "#85be53","value": "99.99"},"keyword4": {"color": "#85be53","value": "66.66"},"first": {"color": "#85be53","value": "您好，本月賬單已出"},"remark": {"color": "#85be53","value": "謝謝使用。"}}}
}

二、java pojo

Item實體?TemplateMessageItem.java

public class TemplateMessageItem {private String value;private String color;public TemplateMessageItem(String value, String color) {this.value = value;this.color = color;}public TemplateMessageItem(String value) {this.value = value;this.color = "#113d83";}public String getValue() {return this.value;}public void setValue(String value) {this.value = value;}public String getColor() {return this.color;}public void setColor(String color) {this.color = color;}
}

最外層：TemplateMessage .java

import com.fasterxml.jackson.annotation.JsonProperty;import java.util.ArrayList;
import java.util.List;
import java.util.Objects;/*** @author hujunzheng* @create 2018-07-11 20:47**/
public class TemplateMessage {@JsonProperty("to_user_id")private String toUserId = "";private String telephone = "";private NestTemplate template = new NestTemplate();public String getToUserId() {return toUserId;}public void setToUserId(String toUserId) {this.toUserId = toUserId;}public String getTelephone() {return telephone;}public void setTelephone(String telephone) {this.telephone = telephone;}public NestTemplate getTemplate() {return template;}public void setTemplate(NestTemplate template) {this.template = template;}public TemplateMessage withToUserId(String toUserId) {this.toUserId = toUserId;return this;}public TemplateMessage withTelephone(String telephone) {this.telephone = telephone;return this;}public TemplateMessage withTemplateId(String templateId) {this.template.setTemplateId(templateId);return this;}public TemplateMessage withContextHeadColor(String color) {this.template.getContext().setHeadColor(color);return this;}public TemplateMessage withContextUrl(String url) {this.template.getContext().setUrl(url);return this;}public TemplateMessage withContextActionName(String actionName) {this.getTemplate().getContext().setActionName(actionName);return this;}public TemplateMessage withContextFirst(TemplateMessageItem first) {this.getTemplate().getContext().setFirst(first);return this;}public TemplateMessage withContextRemark(TemplateMessageItem remark) {this.getTemplate().getContext().setRemark(remark);return this;}public TemplateMessage addContextKeyword(TemplateMessageItem keyword) {List<TemplateMessageItem> keywords = this.getTemplate().getContext().getKeywords();if (Objects.isNull(keyword)) {keywords = new ArrayList<>();this.getTemplate().getContext().setKeywords(keywords);}keywords.add(keyword);return this;}
}

第一個嵌套層：NestTemplate.java

import com.fasterxml.jackson.annotation.JsonProperty;public class NestTemplate {@JsonProperty("template_id")private String templateId;private NestContext context = new NestContext();public String getTemplateId() {return templateId;}public void setTemplateId(String templateId) {this.templateId = templateId;}public NestContext getContext() {return context;}public void setContext(NestContext context) {this.context = context;}
}

第二個嵌套層：NestContext.java

import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.annotation.JsonSerialize;import java.util.List;public class NestContext {@JsonProperty("head_color")private String headColor = "#85be53";private String url;@JsonProperty("action_name")private String actionName;private TemplateMessageItem first;private TemplateMessageItem remark;@JsonProperty("keyword1")@JsonInclude(JsonInclude.Include.NON_NULL)@JsonSerialize(using = TemplateMessageItemsSerializer.class)private List<TemplateMessageItem> keywords;public String getHeadColor() {return headColor;}public void setHeadColor(String headColor) {this.headColor = headColor;}public String getUrl() {return url;}public void setUrl(String url) {this.url = url;}public String getActionName() {return actionName;}public void setActionName(String actionName) {this.actionName = actionName;}public TemplateMessageItem getFirst() {return first;}public void setFirst(TemplateMessageItem first) {this.first = first;}public TemplateMessageItem getRemark() {return remark;}public void setRemark(TemplateMessageItem remark) {this.remark = remark;}public List<TemplateMessageItem> getKeywords() {return keywords;}public void setKeywords(List<TemplateMessageItem> keywords) {this.keywords = keywords;}public static void main(String[] args) throws JsonProcessingException {NestContext context = new NestContext();context.setFirst(new TemplateMessageItem("first"));context.setRemark(new TemplateMessageItem("remark"));context.setUrl("www.baidu.com");context.setActionName("查看詳情");
//        List<TemplateMessageItem> keywords = new ArrayList<>();
//        keywords.add(new TemplateMessageItem("充值金額"));
//        keywords.add(new TemplateMessageItem("手機號"));
//        context.setKeywords(keywords);System.out.println(new ObjectMapper().writeValueAsString(context));}
}

main方法中有注釋：
{
????"url":"www.baidu.com",
????"first":{
????????"value":"first",
????????"color":"#113d83"
????},
????"remark":{
????????"value":"remark",
????????"color":"#113d83"
????},
????"head_color":"#85be53",
????"action_name":"查看詳情"
}

main方法中無注釋
{
????"url":"www.baidu.com",
????"first":{
????????"value":"first",
????????"color":"#113d83"
????},
????"remark":{
????????"value":"remark",
????????"color":"#113d83"
????},
????"head_color":"#85be53",
????"action_name":"查看詳情",
????"keyword1":{
????????"value":"充值金額",
????????"color":"#113d83"
????},
????"keyword2":{
????????"value":"手機號",
????????"color":"#113d83"
????}
}

三、自定義字段序列化

　　將一個List中的每個對象輸出為多個并列json key=value的形式，當然要靠JsonSerializer啦！

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.SerializerProvider;
import org.springframework.util.CollectionUtils;import java.io.IOException;
import java.util.List;/*** @author hujunzheng* @create 2018-07-11 21:30**/
public class TemplateMessageItemsSerializer extends JsonSerializer<List<TemplateMessageItem>> {@Overridepublic void serialize(List<TemplateMessageItem> items, JsonGenerator gen, SerializerProvider serializers) throws IOException, JsonProcessingException {if (CollectionUtils.isEmpty(items)) {return;}gen.writeObject(items.get(0));for (int i = 1; i < items.size(); ++i) {gen.writeFieldName("keyword" + (i + 1));gen.writeObject(items.get(i));}}
}

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