java - Writing multiple objects to csv 1 per line -

java - Writing multiple objects to csv 1 per line -

im trying write serialize object multiline csv file. instead of 1 per line writes in 1 line.

here code.

purchaseorder po = new purchaseorder(entry); arraylist<object> l = lists.newarraylist(); l.add(po); l.add(new purchaseorder(entry)); csvmapper mapper = new csvmapper(); csvschema schema = mapper.schemafor(purchaseorder.class); schema = schema.withcolumnseparator(','); objectwriter author = mapper.writer(schema); file tempfile = new file("test.csv"); fileoutputstream tempfileoutputstream = new fileoutputstream(tempfile); bufferedoutputstream bufferedoutputstream = new bufferedoutputstream(tempfileoutputstream, 1024); outputstreamwriter outputstreamwriter = new outputstreamwriter(bufferedoutputstream, "utf-8"); for(object o : l) { writer.writevalue(outputstreamwriter, o); }

the reason arraylist end result needs generic arraylist need able contain ant type of object.

this solution worked in end. passing in list way it

purchaseorder po = new purchaseorder(entry); arraylist<object> l = lists.newarraylist(); l.add(po); l.add(new purchaseorder(entry)); csvmapper mapper = new csvmapper(); csvschema schema = mapper.schemafor(purchaseorder.class); schema = schema.withcolumnseparator(','); objectwriter author = mapper.writer(schema); file tempfile = new file("test.csv"); fileoutputstream tempfileoutputstream = new fileoutputstream(tempfile); bufferedoutputstream bufferedoutputstream = new bufferedoutputstream(tempfileoutputstream, 1024); outputstreamwriter outputstreamwriter = new outputstreamwriter(bufferedoutputstream, "utf-8"); writer.writevalue(outputstreamwriter, l);

-------new problem------- above sollution works if same object. 2 different object each needing own line schema has alter proving more troublesome thought be.

here im trying @ moment without success.

arraylist<object> l = lists.newarraylist(); l.add(new purchaseordere(entry)); l.add(new purchaseorderl(entry)); csvmapper mapper = new csvmapper(); //csvschema schema = mapper.schemafor(purchaseordere.class); //schema = schema.withcolumnseparator(','); //schema = schema.withlineseparator(""); //objectwriter author = mapper.writer(schema); file tempfile = new file("test.csv"); //fileoutputstream tempfileoutputstream = new fileoutputstream(tempfile); //bufferedoutputstream bufferedoutputstream = new bufferedoutputstream(tempfileoutputstream, 1024); //outputstreamwriter outputstreamwriter = new outputstreamwriter(bufferedoutputstream, "utf-8"); //for(object o : l) { //csvschema schema = mapper.schemafor(o.getclass()); //schema = schema.withcolumnseparator(','); //schema = schema.withlineseparator(""); objectwriter author = mapper.writer(); fileoutputstream tempfileoutputstream = new fileoutputstream(tempfile); bufferedoutputstream bufferedoutputstream = new bufferedoutputstream(tempfileoutputstream, 1024); outputstreamwriter outputstreamwriter = new outputstreamwriter(bufferedoutputstream, "utf-8"); writer.writevalue(outputstreamwriter, l); //}

the pieces commited out have tried sofar without success. there has im missing cnt think great lib wnt provide way serialize different objects same file.

java csv serialization jackson